12621165887 has 4 divisors (see below), whose sum is σ = 13768544616. Its totient is φ = 11473787160.

The previous prime is 12621165877. The next prime is 12621165901. The reversal of 12621165887 is 78856112621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12621165887 - 2⁴ = 12621165871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621165877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573689348 + ... + 573689369.

It is an arithmetic number, because the mean of its divisors is an integer number (3442136154).

Almost surely, 2^12621165887 is an apocalyptic number.

12621165887 is a deficient number, since it is larger than the sum of its proper divisors (1147378729).

12621165887 is a wasteful number, since it uses less digits than its factorization.

12621165887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147378728.

The product of its digits is 322560, while the sum is 47.

The spelling of 12621165887 in words is "twelve billion, six hundred twenty-one million, one hundred sixty-five thousand, eight hundred eighty-seven".