12640510531 has 8 divisors (see below), whose sum is σ = 14600803824. Its totient is φ = 10815409920.

The previous prime is 12640510511. The next prime is 12640510537. The reversal of 12640510531 is 13501504621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12640510531 - 2⁷ = 12640510403 is a prime.

It is a super-2 number, since 2×12640510531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12640510531.

It is not an unprimeable number, because it can be changed into a prime (12640510537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33797970 + ... + 33798343.

It is an arithmetic number, because the mean of its divisors is an integer number (1825100478).

Almost surely, 2^12640510531 is an apocalyptic number.

12640510531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12640510531 is a deficient number, since it is larger than the sum of its proper divisors (1960293293).

12640510531 is a wasteful number, since it uses less digits than its factorization.

12640510531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67596341.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 12640510531 in words is "twelve billion, six hundred forty million, five hundred ten thousand, five hundred thirty-one".