11747564639 has 32 divisors (see below), whose sum is σ = 12573014400. Its totient is φ = 10961713152.

The previous prime is 11747564629. The next prime is 11747564683. The reversal of 11747564639 is 93646574711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11747564639 - 2⁴ = 11747564623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11747564629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19611662 + ... + 19612260.

It is an arithmetic number, because the mean of its divisors is an integer number (392906700).

Almost surely, 2^11747564639 is an apocalyptic number.

11747564639 is a deficient number, since it is larger than the sum of its proper divisors (825449761).

11747564639 is a wasteful number, since it uses less digits than its factorization.

11747564639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899.

The product of its digits is 3810240, while the sum is 53.

The spelling of 11747564639 in words is "eleven billion, seven hundred forty-seven million, five hundred sixty-four thousand, six hundred thirty-nine".