55909815994 has 4 divisors (see below), whose sum is σ = 83864723994. Its totient is φ = 27954907996.

The previous prime is 55909815953. The next prime is 55909816013. The reversal of 55909815994 is 49951890955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49951890955 = 5 ⋅9990378191.

It can be written as a sum of positive squares in only one way, i.e., 39368512225 + 16541303769 = 198415^2 + 128613^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13977453997 + ... + 13977454000.

Almost surely, 2^55909815994 is an apocalyptic number.

55909815994 is a deficient number, since it is larger than the sum of its proper divisors (27954908000).

55909815994 is a wasteful number, since it uses less digits than its factorization.

55909815994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27954907999.

The product of its (nonzero) digits is 26244000, while the sum is 64.

The spelling of 55909815994 in words is "fifty-five billion, nine hundred nine million, eight hundred fifteen thousand, nine hundred ninety-four".