12387494505 has 16 divisors (see below), whose sum is σ = 20863149120. Its totient is φ = 6258944448.

The previous prime is 12387494479. The next prime is 12387494521. The reversal of 12387494505 is 50549478321.

It is not a de Polignac number, because 12387494505 - 2¹⁶ = 12387428969 is a prime.

It is a super-2 number, since 2×12387494505² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21732162 + ... + 21732731.

It is an arithmetic number, because the mean of its divisors is an integer number (1303946820).

Almost surely, 2^12387494505 is an apocalyptic number.

12387494505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12387494505 is a deficient number, since it is larger than the sum of its proper divisors (8475654615).

12387494505 is a wasteful number, since it uses less digits than its factorization.

12387494505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43464920.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 12387494505 in words is "twelve billion, three hundred eighty-seven million, four hundred ninety-four thousand, five hundred five".