660296591 has 4 divisors (see below), whose sum is σ = 670151832. Its totient is φ = 650441352.

The previous prime is 660296579. The next prime is 660296597. The reversal of 660296591 is 195692066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660296591 - 2¹⁸ = 660034447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660296597) 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, 4927520 + ... + 4927653.

It is an arithmetic number, because the mean of its divisors is an integer number (167537958).

Almost surely, 2^660296591 is an apocalyptic number.

660296591 is a deficient number, since it is larger than the sum of its proper divisors (9855241).

660296591 is an equidigital number, since it uses as much as digits as its factorization.

660296591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9855240.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 660296591 is about 25696.2369034845. The cubic root of 660296591 is about 870.7891685535.

The spelling of 660296591 in words is "six hundred sixty million, two hundred ninety-six thousand, five hundred ninety-one".