661145300333564 has 24 divisors (see below), whose sum is σ = 1157968778206800. Its totient is φ = 330297169758336.

The previous prime is 661145300333543. The next prime is 661145300333653. The reversal of 661145300333564 is 465333003541166.

It is a super-2 number, since 2×661145300333564² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17356979 + ... + 40293365.

It is an arithmetic number, because the mean of its divisors is an integer number (48248699091950).

Almost surely, 2^{661145300333564} is an apocalyptic number.

It is an amenable number.

661145300333564 is a deficient number, since it is larger than the sum of its proper divisors (496823477873236).

661145300333564 is a wasteful number, since it uses less digits than its factorization.

661145300333564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22942397 (or 22942395 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 50.

The spelling of 661145300333564 in words is "six hundred sixty-one trillion, one hundred forty-five billion, three hundred million, three hundred thirty-three thousand, five hundred sixty-four".