661364590 has 8 divisors (see below), whose sum is σ = 1190456280. Its totient is φ = 264545832.

The previous prime is 661364573. The next prime is 661364591. The reversal of 661364590 is 95463166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661364591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33068220 + ... + 33068239.

It is an arithmetic number, because the mean of its divisors is an integer number (148807035).

Almost surely, 2^661364590 is an apocalyptic number.

661364590 is a deficient number, since it is larger than the sum of its proper divisors (529091690).

661364590 is a wasteful number, since it uses less digits than its factorization.

661364590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66136466.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 661364590 is about 25717.0097406366. The cubic root of 661364590 is about 871.2584026383.

The spelling of 661364590 in words is "six hundred sixty-one million, three hundred sixty-four thousand, five hundred ninety".