55516861555 has 4 divisors (see below), whose sum is σ = 66620233872. Its totient is φ = 44413489240.

The previous prime is 55516861549. The next prime is 55516861651.

55516861555 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55516861555 - 2⁵ = 55516861523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551686151 + ... + 5551686160.

It is an arithmetic number, because the mean of its divisors is an integer number (16655058468).

Almost surely, 2^55516861555 is an apocalyptic number.

55516861555 is a deficient number, since it is larger than the sum of its proper divisors (11103372317).

55516861555 is a wasteful number, since it uses less digits than its factorization.

55516861555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11103372316.

The product of its digits is 4500000, while the sum is 52.

The spelling of 55516861555 in words is "fifty-five billion, five hundred sixteen million, eight hundred sixty-one thousand, five hundred fifty-five".