155621100408 has 64 divisors (see below), whose sum is σ = 415139289600. Its totient is φ = 48470296320.

The previous prime is 155621100359. The next prime is 155621100449. The reversal of 155621100408 is 804001126551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2304208 + ... + 2370783.

It is an arithmetic number, because the mean of its divisors is an integer number (6486551400).

Almost surely, 2^155621100408 is an apocalyptic number.

It is an amenable number.

155621100408 is an abundant number, since it is smaller than the sum of its proper divisors (259518189192).

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

155621100408 is a wasteful number, since it uses less digits than its factorization.

155621100408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675092 (or 4675088 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

Adding to 155621100408 its reverse (804001126551), we get a palindrome (959622226959).

The spelling of 155621100408 in words is "one hundred fifty-five billion, six hundred twenty-one million, one hundred thousand, four hundred eight".