10000656391 has 4 divisors (see below), whose sum is σ = 10909806984. Its totient is φ = 9091505800.

The previous prime is 10000656371. The next prime is 10000656397. The reversal of 10000656391 is 19365600001.

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

It is a cyclic number.

It is not a de Polignac number, because 10000656391 - 2⁵ = 10000656359 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 (10000656397) 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, 454575280 + ... + 454575301.

It is an arithmetic number, because the mean of its divisors is an integer number (2727451746).

Almost surely, 2^10000656391 is an apocalyptic number.

10000656391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10000656391 is a deficient number, since it is larger than the sum of its proper divisors (909150593).

10000656391 is an equidigital number, since it uses as much as digits as its factorization.

10000656391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909150592.

The product of its (nonzero) digits is 4860, while the sum is 31.

The spelling of 10000656391 in words is "ten billion, six hundred fifty-six thousand, three hundred ninety-one".