661313590 has 32 divisors (see below), whose sum is σ = 1361608704. Its totient is φ = 226537440.

The previous prime is 661313579. The next prime is 661313591. The reversal of 661313590 is 95313166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661313591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92235 + ... + 99145.

It is an arithmetic number, because the mean of its divisors is an integer number (42550272).

Almost surely, 2^661313590 is an apocalyptic number.

661313590 is an abundant number, since it is smaller than the sum of its proper divisors (700295114).

661313590 is a wasteful number, since it uses less digits than its factorization.

661313590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8292.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 661313590 is about 25716.0181598940. The cubic root of 661313590 is about 871.2360068617.

The spelling of 661313590 in words is "six hundred sixty-one million, three hundred thirteen thousand, five hundred ninety".