665760651 has 8 divisors (see below), whose sum is σ = 889896144. Its totient is φ = 442732800.

The previous prime is 665760617. The next prime is 665760653. The reversal of 665760651 is 156067566.

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

It is not a de Polignac number, because 665760651 - 2⁷ = 665760523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665760653) 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, 275506 + ... + 277911.

It is an arithmetic number, because the mean of its divisors is an integer number (111237018).

Almost surely, 2^665760651 is an apocalyptic number.

665760651 is a deficient number, since it is larger than the sum of its proper divisors (224135493).

665760651 is a wasteful number, since it uses less digits than its factorization.

665760651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553821.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 665760651 is about 25802.3380917311. The cubic root of 665760651 is about 873.1845465345.

The spelling of 665760651 in words is "six hundred sixty-five million, seven hundred sixty thousand, six hundred fifty-one".