155621132304 has 80 divisors (see below), whose sum is σ = 438682785600. Its totient is φ = 47145646080.

The previous prime is 155621132291. The next prime is 155621132327. The reversal of 155621132304 is 403231126551.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 2105772 + ... + 2178420.

It is an arithmetic number, because the mean of its divisors is an integer number (5483534820).

Almost surely, 2^155621132304 is an apocalyptic number.

It is an amenable number.

155621132304 is an abundant number, since it is smaller than the sum of its proper divisors (283061653296).

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

155621132304 is a wasteful number, since it uses less digits than its factorization.

155621132304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76728 (or 76722 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 155621132304 its reverse (403231126551), we get a palindrome (558852258855).

The spelling of 155621132304 in words is "one hundred fifty-five billion, six hundred twenty-one million, one hundred thirty-two thousand, three hundred four".