10640951991 has 16 divisors (see below), whose sum is σ = 16307973600. Its totient is φ = 6849347904.

The previous prime is 10640951977. The next prime is 10640951999. The reversal of 10640951991 is 19915904601.

10640951991 is a `hidden beast` number, since 1 + 0 + 6 + 40 + 9 + 519 + 91 = 666.

It is not a de Polignac number, because 10640951991 - 2¹³ = 10640943799 is a prime.

It is a super-2 number, since 2×10640951991² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10640951999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6794206 + ... + 6795771.

It is an arithmetic number, because the mean of its divisors is an integer number (1019248350).

Almost surely, 2^10640951991 is an apocalyptic number.

10640951991 is a deficient number, since it is larger than the sum of its proper divisors (5667021609).

10640951991 is a wasteful number, since it uses less digits than its factorization.

10640951991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13590015 (or 13590009 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The spelling of 10640951991 in words is "ten billion, six hundred forty million, nine hundred fifty-one thousand, nine hundred ninety-one".