12640886581 has 8 divisors (see below), whose sum is σ = 12683712384. Its totient is φ = 12598101120.

The previous prime is 12640886569. The next prime is 12640886597. The reversal of 12640886581 is 18568804621.

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 12640886581 - 2¹¹ = 12640884533 is a prime.

It is a super-2 number, since 2×12640886581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640886521) 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, 700980 + ... + 718786.

It is an arithmetic number, because the mean of its divisors is an integer number (1585464048).

Almost surely, 2^12640886581 is an apocalyptic number.

It is an amenable number.

12640886581 is a deficient number, since it is larger than the sum of its proper divisors (42825803).

12640886581 is a wasteful number, since it uses less digits than its factorization.

12640886581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20171.

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 12640886581 in words is "twelve billion, six hundred forty million, eight hundred eighty-six thousand, five hundred eighty-one".