55555631681 has 32 divisors (see below), whose sum is σ = 65462501376. Its totient is φ = 46621080000.

The previous prime is 55555631669. The next prime is 55555631689. The reversal of 55555631681 is 18613655555.

It is not a de Polignac number, because 55555631681 - 2¹⁰ = 55555630657 is a prime.

It is a super-2 number, since 2×55555631681² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55555631689) 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, 2868731 + ... + 2888031.

It is an arithmetic number, because the mean of its divisors is an integer number (2045703168).

Almost surely, 2^55555631681 is an apocalyptic number.

It is an amenable number.

55555631681 is a deficient number, since it is larger than the sum of its proper divisors (9906869695).

55555631681 is a wasteful number, since it uses less digits than its factorization.

55555631681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19733.

The product of its digits is 2700000, while the sum is 50.

The spelling of 55555631681 in words is "fifty-five billion, five hundred fifty-five million, six hundred thirty-one thousand, six hundred eighty-one".