2660646440644 has 24 divisors (see below), whose sum is σ = 4868231034240. Its totient is φ = 1269953270784.

The previous prime is 2660646440611. The next prime is 2660646440659. The reversal of 2660646440644 is 4460446460662.

It is a super-2 number, since 2×2660646440644² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2660646440591 and 2660646440600.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 28701309 + ... + 28793860.

It is an arithmetic number, because the mean of its divisors is an integer number (202842959760).

Almost surely, 2^{2660646440644} is an apocalyptic number.

It is an amenable number.

2660646440644 is a deficient number, since it is larger than the sum of its proper divisors (2207584593596).

2660646440644 is a wasteful number, since it uses less digits than its factorization.

2660646440644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57495699 (or 57495697 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 52.

The spelling of 2660646440644 in words is "two trillion, six hundred sixty billion, six hundred forty-six million, four hundred forty thousand, six hundred forty-four".