665406772537 has 8 divisors (see below), whose sum is σ = 721747248320. Its totient is φ = 609802773840.

The previous prime is 665406772523. The next prime is 665406772549. The reversal of 665406772537 is 735277604566.

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

It is not a de Polignac number, because 665406772537 - 2¹¹ = 665406770489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665406772237) 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, 184117389 + ... + 184121002.

It is an arithmetic number, because the mean of its divisors is an integer number (90218406040).

Almost surely, 2^665406772537 is an apocalyptic number.

It is an amenable number.

665406772537 is a deficient number, since it is larger than the sum of its proper divisors (56340475783).

665406772537 is a wasteful number, since it uses less digits than its factorization.

665406772537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368238543.

The product of its (nonzero) digits is 44452800, while the sum is 58.

The spelling of 665406772537 in words is "six hundred sixty-five billion, four hundred six million, seven hundred seventy-two thousand, five hundred thirty-seven".