12487969521 has 12 divisors (see below), whose sum is σ = 18070569972. Its totient is φ = 8310362976.

The previous prime is 12487969519. The next prime is 12487969709. The reversal of 12487969521 is 12596978421.

It is a happy number.

12487969521 is a `hidden beast` number, since 1 + 2 + 48 + 79 + 6 + 9 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4067888400 + 8420081121 = 63780^2 + 91761^2 .

It is not a de Polignac number, because 12487969521 - 2¹ = 12487969519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12487969511) 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, 1240546 + ... + 1250571.

It is an arithmetic number, because the mean of its divisors is an integer number (1505880831).

Almost surely, 2^12487969521 is an apocalyptic number.

It is an amenable number.

12487969521 is a deficient number, since it is larger than the sum of its proper divisors (5582600451).

12487969521 is a wasteful number, since it uses less digits than its factorization.

12487969521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491680 (or 2491677 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 12487969521 in words is "twelve billion, four hundred eighty-seven million, nine hundred sixty-nine thousand, five hundred twenty-one".