661364589 has 16 divisors (see below), whose sum is σ = 906006528. Its totient is φ = 428929392.

The previous prime is 661364573. The next prime is 661364591. The reversal of 661364589 is 985463166.

It is not a de Polignac number, because 661364589 - 2⁴ = 661364573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661364189) 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, 9504 + ... + 37590.

It is an arithmetic number, because the mean of its divisors is an integer number (56625408).

Almost surely, 2^661364589 is an apocalyptic number.

It is an amenable number.

661364589 is a deficient number, since it is larger than the sum of its proper divisors (244641939).

661364589 is a wasteful number, since it uses less digits than its factorization.

661364589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28304.

The product of its digits is 933120, while the sum is 48.

The square root of 661364589 is about 25717.0097211943. The cubic root of 661364589 is about 871.2584021992.

The spelling of 661364589 in words is "six hundred sixty-one million, three hundred sixty-four thousand, five hundred eighty-nine".