10621165646 has 24 divisors (see below), whose sum is σ = 19716048144. Its totient is φ = 4201778880.

The previous prime is 10621165637. The next prime is 10621165691. The reversal of 10621165646 is 64656112601.

It is a happy number.

It is a super-2 number, since 2×10621165646² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2242175 + ... + 2246906.

It is an arithmetic number, because the mean of its divisors is an integer number (821502006).

Almost surely, 2^10621165646 is an apocalyptic number.

10621165646 is a deficient number, since it is larger than the sum of its proper divisors (9094882498).

10621165646 is a wasteful number, since it uses less digits than its factorization.

10621165646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489116 (or 4489103 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 10621165646 in words is "ten billion, six hundred twenty-one million, one hundred sixty-five thousand, six hundred forty-six".