12491555715 has 48 divisors (see below), whose sum is σ = 22938484608. Its totient is φ = 6266769408.

The previous prime is 12491555711. The next prime is 12491555717. The reversal of 12491555715 is 51755519421.

12491555715 is a `hidden beast` number, since 1 + 2 + 4 + 91 + 5 + 557 + 1 + 5 = 666.

It is not a de Polignac number, because 12491555715 - 2² = 12491555711 is a prime.

It is a super-2 number, since 2×12491555715² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (12491555711) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1868619 + ... + 1875291.

It is an arithmetic number, because the mean of its divisors is an integer number (477885096).

Almost surely, 2^12491555715 is an apocalyptic number.

12491555715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12491555715 is a deficient number, since it is larger than the sum of its proper divisors (10446928893).

12491555715 is a wasteful number, since it uses less digits than its factorization.

12491555715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9148 (or 9145 counting only the distinct ones).

The product of its digits is 315000, while the sum is 45.

The spelling of 12491555715 in words is "twelve billion, four hundred ninety-one million, five hundred fifty-five thousand, seven hundred fifteen".