655771404177556 has 12 divisors (see below), whose sum is σ = 1149084562694292. Its totient is φ = 327461529122048.

The previous prime is 655771404177511. The next prime is 655771404177607.

655771404177556 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 70988544720900 + 584782859456656 = 8425470^2 + 24182284^2 .

It is a super-2 number, since 2×655771404177556² (a number of 30 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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106043238205 + ... + 106043244388.

It is an arithmetic number, because the mean of its divisors is an integer number (95757046891191).

Almost surely, 2^{655771404177556} is an apocalyptic number.

It is an amenable number.

655771404177556 is a deficient number, since it is larger than the sum of its proper divisors (493313158516736).

655771404177556 is a wasteful number, since it uses less digits than its factorization.

655771404177556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212086483370 (or 212086483368 counting only the distinct ones).

The product of its (nonzero) digits is 864360000, while the sum is 70.

The spelling of 655771404177556 in words is "six hundred fifty-five trillion, seven hundred seventy-one billion, four hundred four million, one hundred seventy-seven thousand, five hundred fifty-six".