11997456507 has 12 divisors (see below), whose sum is σ = 17971499000. Its totient is φ = 7998304176.

The previous prime is 11997456481. The next prime is 11997456553. The reversal of 11997456507 is 70565479911.

11997456507 is a `hidden beast` number, since 1 + 1 + 9 + 9 + 74 + 565 + 0 + 7 = 666.

It is not a de Polignac number, because 11997456507 - 2⁷ = 11997456379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11997456707) 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, 24685882 + ... + 24686367.

Almost surely, 2^11997456507 is an apocalyptic number.

11997456507 is a deficient number, since it is larger than the sum of its proper divisors (5974042493).

11997456507 is an frugal number, since it uses more digits than its factorization.

11997456507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49372264 (or 49372252 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 54.

The spelling of 11997456507 in words is "eleven billion, nine hundred ninety-seven million, four hundred fifty-six thousand, five hundred seven".