666636621041562 has 32 divisors (see below), whose sum is σ = 1333644620673024. Its totient is φ = 222150312140400.

The previous prime is 666636621041557. The next prime is 666636621041597. The reversal of 666636621041562 is 265140126636666.

It is a super-2 number, since 2×666636621041562² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666636621041496 and 666636621041505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2374674387 + ... + 2374955097.

It is an arithmetic number, because the mean of its divisors is an integer number (41676394396032).

Almost surely, 2^{666636621041562} is an apocalyptic number.

666636621041562 is an abundant number, since it is smaller than the sum of its proper divisors (667007999631462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666636621041562 is a wasteful number, since it uses less digits than its factorization.

666636621041562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389554.

The product of its (nonzero) digits is 67184640, while the sum is 60.

The spelling of 666636621041562 in words is "six hundred sixty-six trillion, six hundred thirty-six billion, six hundred twenty-one million, forty-one thousand, five hundred sixty-two".