661333044 has 48 divisors (see below), whose sum is σ = 1612154880. Its totient is φ = 210753120.

The previous prime is 661333033. The next prime is 661333063. The reversal of 661333044 is 440333166.

It is a super-2 number, since 2×661333044² = 874722790172611872, which 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 15 ways as a sum of consecutive naturals, for example, 20167 + ... + 41585.

It is an arithmetic number, because the mean of its divisors is an integer number (33586560).

Almost surely, 2^661333044 is an apocalyptic number.

It is an amenable number.

661333044 is an abundant number, since it is smaller than the sum of its proper divisors (950821836).

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

661333044 is a wasteful number, since it uses less digits than its factorization.

661333044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21540 (or 21538 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 661333044 is about 25716.3964038510. The cubic root of 661333044 is about 871.2445498885.

The spelling of 661333044 in words is "six hundred sixty-one million, three hundred thirty-three thousand, forty-four".