113564021566 has 16 divisors (see below), whose sum is σ = 174120171264. Its totient is φ = 55526044504.

The previous prime is 113564021561. The next prime is 113564021579. The reversal of 113564021566 is 665120465311.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113564021561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410080 + ... + 628723.

It is an arithmetic number, because the mean of its divisors is an integer number (10882510704).

Almost surely, 2^113564021566 is an apocalyptic number.

113564021566 is a deficient number, since it is larger than the sum of its proper divisors (60556149698).

113564021566 is a wasteful number, since it uses less digits than its factorization.

113564021566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040015.

The product of its (nonzero) digits is 129600, while the sum is 40.

Adding to 113564021566 its reverse (665120465311), we get a palindrome (778684486877).

The spelling of 113564021566 in words is "one hundred thirteen billion, five hundred sixty-four million, twenty-one thousand, five hundred sixty-six".