55156032681 has 4 divisors (see below), whose sum is σ = 73541376912. Its totient is φ = 36770688452.

The previous prime is 55156032647. The next prime is 55156032707. The reversal of 55156032681 is 18623065155.

It is a happy number.

55156032681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55156032681 - 2¹⁰ = 55156031657 is a prime.

It is a super-2 number, since 2×55156032681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55156032601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9192672111 + ... + 9192672116.

It is an arithmetic number, because the mean of its divisors is an integer number (18385344228).

Almost surely, 2^55156032681 is an apocalyptic number.

It is an amenable number.

55156032681 is a deficient number, since it is larger than the sum of its proper divisors (18385344231).

55156032681 is a wasteful number, since it uses less digits than its factorization.

55156032681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18385344230.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 55156032681 in words is "fifty-five billion, one hundred fifty-six million, thirty-two thousand, six hundred eighty-one".