665647377 has 8 divisors (see below), whose sum is σ = 887788416. Its totient is φ = 443635632.

The previous prime is 665647373. The next prime is 665647379. The reversal of 665647377 is 773746566.

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

It is not a de Polignac number, because 665647377 - 2² = 665647373 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665647373) 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, 19593 + ... + 41414.

It is an arithmetic number, because the mean of its divisors is an integer number (110973552).

Almost surely, 2^665647377 is an apocalyptic number.

It is an amenable number.

665647377 is a deficient number, since it is larger than the sum of its proper divisors (222141039).

665647377 is a wasteful number, since it uses less digits than its factorization.

665647377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64647.

The product of its digits is 4445280, while the sum is 51.

The square root of 665647377 is about 25800.1429647202. The cubic root of 665647377 is about 873.1350218711.

The spelling of 665647377 in words is "six hundred sixty-five million, six hundred forty-seven thousand, three hundred seventy-seven".