55561755726 has 24 divisors (see below), whose sum is σ = 120393786240. Its totient is φ = 18519049536.

The previous prime is 55561755713. The next prime is 55561755763. The reversal of 55561755726 is 62755716555.

55561755726 is a `hidden beast` number, since 5 + 5 + 5 + 61 + 7 + 5 + 572 + 6 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106771 + ... + 350033.

It is an arithmetic number, because the mean of its divisors is an integer number (5016407760).

Almost surely, 2^55561755726 is an apocalyptic number.

55561755726 is an abundant number, since it is smaller than the sum of its proper divisors (64832030514).

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

55561755726 is a wasteful number, since it uses less digits than its factorization.

55561755726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255960 (or 255957 counting only the distinct ones).

The product of its digits is 11025000, while the sum is 54.

The spelling of 55561755726 in words is "fifty-five billion, five hundred sixty-one million, seven hundred fifty-five thousand, seven hundred twenty-six".