665346307691 has 8 divisors (see below), whose sum is σ = 716546901840. Its totient is φ = 614148586272.

The previous prime is 665346307621. The next prime is 665346307697. The reversal of 665346307691 is 196703643566.

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

It is a de Polignac number, because none of the positive numbers 2^k-665346307691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665346307697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224576 + ... + 1175213.

It is an arithmetic number, because the mean of its divisors is an integer number (89568362730).

Almost surely, 2^665346307691 is an apocalyptic number.

665346307691 is a deficient number, since it is larger than the sum of its proper divisors (51200594149).

665346307691 is a wasteful number, since it uses less digits than its factorization.

665346307691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436365.

The product of its (nonzero) digits is 14696640, while the sum is 56.

The spelling of 665346307691 in words is "six hundred sixty-five billion, three hundred forty-six million, three hundred seven thousand, six hundred ninety-one".