56191686590 has 32 divisors (see below), whose sum is σ = 110711101536. Its totient is φ = 20407570560.

The previous prime is 56191686583. The next prime is 56191686599. The reversal of 56191686590 is 9568619165.

It is a happy number.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56191686599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3535052 + ... + 3550911.

It is an arithmetic number, because the mean of its divisors is an integer number (3459721923).

Almost surely, 2^56191686590 is an apocalyptic number.

56191686590 is a deficient number, since it is larger than the sum of its proper divisors (54519414946).

56191686590 is a wasteful number, since it uses less digits than its factorization.

56191686590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7086044.

The product of its (nonzero) digits is 3499200, while the sum is 56.

The spelling of 56191686590 in words is "fifty-six billion, one hundred ninety-one million, six hundred eighty-six thousand, five hundred ninety".