11865821607 has 12 divisors (see below), whose sum is σ = 17152021224. Its totient is φ = 7904778000.

The previous prime is 11865821599. The next prime is 11865821629. The reversal of 11865821607 is 70612856811.

11865821607 is a `hidden beast` number, since 1 + 1 + 8 + 6 + 582 + 1 + 60 + 7 = 666.

It is not a de Polignac number, because 11865821607 - 2³ = 11865821599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11865821657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467769 + ... + 492482.

It is an arithmetic number, because the mean of its divisors is an integer number (1429335102).

Almost surely, 2^11865821607 is an apocalyptic number.

11865821607 is a deficient number, since it is larger than the sum of its proper divisors (5286199617).

11865821607 is a wasteful number, since it uses less digits than its factorization.

11865821607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961630 (or 961627 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 11865821607 in words is "eleven billion, eight hundred sixty-five million, eight hundred twenty-one thousand, six hundred seven".