56091191218 has 4 divisors (see below), whose sum is σ = 84136786830. Its totient is φ = 28045595608.

The previous prime is 56091191209. The next prime is 56091191231. The reversal of 56091191218 is 81219119065.

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

It can be written as a sum of positive squares in only one way, i.e., 41329670209 + 14761521009 = 203297^2 + 121497^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14022797803 + ... + 14022797806.

Almost surely, 2^56091191218 is an apocalyptic number.

56091191218 is a deficient number, since it is larger than the sum of its proper divisors (28045595612).

56091191218 is a wasteful number, since it uses less digits than its factorization.

56091191218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28045595611.

The product of its (nonzero) digits is 38880, while the sum is 43.

The spelling of 56091191218 in words is "fifty-six billion, ninety-one million, one hundred ninety-one thousand, two hundred eighteen".