661090584 has 64 divisors (see below), whose sum is σ = 2060547840. Its totient is φ = 171711360.

The previous prime is 661090513. The next prime is 661090597. The reversal of 661090584 is 485090166.

661090584 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×661090584² = 874081520506922112, 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, 177019 + ... + 180714.

It is an arithmetic number, because the mean of its divisors is an integer number (32196060).

Almost surely, 2^661090584 is an apocalyptic number.

It is an amenable number.

661090584 is an abundant number, since it is smaller than the sum of its proper divisors (1399457256).

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

661090584 is a wasteful number, since it uses less digits than its factorization.

661090584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357760 (or 357756 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 661090584 is about 25711.6818586416. The cubic root of 661090584 is about 871.1380640686.

The spelling of 661090584 in words is "six hundred sixty-one million, ninety thousand, five hundred eighty-four".