55660776215551 has 32 divisors (see below), whose sum is σ = 62065343325888. Its totient is φ = 49583795466240.

The previous prime is 55660776215543. The next prime is 55660776215587. The reversal of 55660776215551 is 15551267706655.

It is a cyclic number.

It is not a de Polignac number, because 55660776215551 - 2³ = 55660776215543 is a prime.

It is a super-2 number, since 2×55660776215551² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55660776215551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55660776215851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28800975 + ... + 30672751.

It is an arithmetic number, because the mean of its divisors is an integer number (1939541978934).

Almost surely, 2^{55660776215551} is an apocalyptic number.

55660776215551 is a deficient number, since it is larger than the sum of its proper divisors (6404567110337).

55660776215551 is a wasteful number, since it uses less digits than its factorization.

55660776215551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872331.

The product of its (nonzero) digits is 66150000, while the sum is 61.

The spelling of 55660776215551 in words is "fifty-five trillion, six hundred sixty billion, seven hundred seventy-six million, two hundred fifteen thousand, five hundred fifty-one".