155020421500 has 48 divisors (see below), whose sum is σ = 386930980800. Its totient is φ = 53149857600.

The previous prime is 155020421473. The next prime is 155020421513. The reversal of 155020421500 is 5124020551.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22142275 + ... + 22149274.

It is an arithmetic number, because the mean of its divisors is an integer number (8061062100).

Almost surely, 2^155020421500 is an apocalyptic number.

155020421500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155020421500 is an abundant number, since it is smaller than the sum of its proper divisors (231910559300).

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

155020421500 is a wasteful number, since it uses less digits than its factorization.

155020421500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44291575 (or 44291563 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 155020421500 in words is "one hundred fifty-five billion, twenty million, four hundred twenty-one thousand, five hundred".