55661556351 has 32 divisors (see below), whose sum is σ = 76429836288. Its totient is φ = 36014952960.

The previous prime is 55661556347. The next prime is 55661556359. The reversal of 55661556351 is 15365516655.

It is not a de Polignac number, because 55661556351 - 2² = 55661556347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55661556351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55661556359) 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, 9072681 + ... + 9078813.

It is an arithmetic number, because the mean of its divisors is an integer number (2388432384).

Almost surely, 2^55661556351 is an apocalyptic number.

55661556351 is a deficient number, since it is larger than the sum of its proper divisors (20768279937).

55661556351 is a wasteful number, since it uses less digits than its factorization.

55661556351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711.

The product of its digits is 2025000, while the sum is 48.

The spelling of 55661556351 in words is "fifty-five billion, six hundred sixty-one million, five hundred fifty-six thousand, three hundred fifty-one".