11563890957 has 6 divisors (see below), whose sum is σ = 16703398062. Its totient is φ = 7709260632.

The previous prime is 11563890953. The next prime is 11563891007. The reversal of 11563890957 is 75909836511.

It can be written as a sum of positive squares in only one way, i.e., 6679139076 + 4884751881 = 81726^2 + 69891^2 .

It is not a de Polignac number, because 11563890957 - 2² = 11563890953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11563890953) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642438378 + ... + 642438395.

It is an arithmetic number, because the mean of its divisors is an integer number (2783899677).

Almost surely, 2^11563890957 is an apocalyptic number.

It is an amenable number.

11563890957 is a deficient number, since it is larger than the sum of its proper divisors (5139507105).

11563890957 is a wasteful number, since it uses less digits than its factorization.

11563890957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284876779 (or 1284876776 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 11563890957 in words is "eleven billion, five hundred sixty-three million, eight hundred ninety thousand, nine hundred fifty-seven".