55815051855 has 96 divisors (see below), whose sum is σ = 96590430720. Its totient is φ = 27498873600.

The previous prime is 55815051839. The next prime is 55815051881.

It is a happy number.

55815051855 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55815051855 - 2⁴ = 55815051839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 44332216 + ... + 44333474.

It is an arithmetic number, because the mean of its divisors is an integer number (1006150320).

Almost surely, 2^55815051855 is an apocalyptic number.

55815051855 is a deficient number, since it is larger than the sum of its proper divisors (40775378865).

55815051855 is a wasteful number, since it uses less digits than its factorization.

55815051855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501 (or 1478 counting only the distinct ones).

The product of its (nonzero) digits is 1000000, while the sum is 48.

The spelling of 55815051855 in words is "fifty-five billion, eight hundred fifteen million, fifty-one thousand, eight hundred fifty-five".