655129921556 has 48 divisors (see below), whose sum is σ = 1294949160960. Its totient is φ = 287309484000.

The previous prime is 655129921541. The next prime is 655129921561.

655129921556 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×655129921556² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274046 + ... + 1177013.

It is an arithmetic number, because the mean of its divisors is an integer number (26978107520).

Almost surely, 2^655129921556 is an apocalyptic number.

It is an amenable number.

655129921556 is a deficient number, since it is larger than the sum of its proper divisors (639819239404).

655129921556 is a wasteful number, since it uses less digits than its factorization.

655129921556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451436 (or 1451434 counting only the distinct ones).

The product of its digits is 7290000, while the sum is 56.

The spelling of 655129921556 in words is "six hundred fifty-five billion, one hundred twenty-nine million, nine hundred twenty-one thousand, five hundred fifty-six".