10390937656491 has 64 divisors (see below), whose sum is σ = 17723360793600. Its totient is φ = 5893740776448.

The previous prime is 10390937656487. The next prime is 10390937656511. The reversal of 10390937656491 is 19465673909301.

10390937656491 is a `hidden beast` number, since 1 + 0 + 3 + 9 + 0 + 93 + 7 + 6 + 56 + 491 = 666.

It is not a de Polignac number, because 10390937656491 - 2² = 10390937656487 is a prime.

It is a super-2 number, since 2×10390937656491² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (10390937656091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 135336085 + ... + 135412841.

It is an arithmetic number, because the mean of its divisors is an integer number (276927512400).

Almost surely, 2^{10390937656491} is an apocalyptic number.

10390937656491 is a deficient number, since it is larger than the sum of its proper divisors (7332423137109).

10390937656491 is a wasteful number, since it uses less digits than its factorization.

10390937656491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82065 (or 82059 counting only the distinct ones).

The product of its (nonzero) digits is 33067440, while the sum is 63.

The spelling of 10390937656491 in words is "ten trillion, three hundred ninety billion, nine hundred thirty-seven million, six hundred fifty-six thousand, four hundred ninety-one".