155121458400 has 144 divisors (see below), whose sum is σ = 561022686000. Its totient is φ = 41365716480.

The previous prime is 155121458389. The next prime is 155121458449. The reversal of 155121458400 is 4854121551.

155121458400 is a `hidden beast` number, since 1 + 5 + 51 + 21 + 4 + 584 + 0 + 0 = 666.

155121458400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×155121458400² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3569175 + ... + 3612374.

It is an arithmetic number, because the mean of its divisors is an integer number (3895990875).

Almost surely, 2^155121458400 is an apocalyptic number.

155121458400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155121458400 is an abundant number, since it is smaller than the sum of its proper divisors (405901227600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155121458400 is a wasteful number, since it uses less digits than its factorization.

155121458400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7181578 (or 7181559 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

Adding to 155121458400 its reverse (4854121551), we get a palindrome (159975579951).

The spelling of 155121458400 in words is "one hundred fifty-five billion, one hundred twenty-one million, four hundred fifty-eight thousand, four hundred".