665038377 has 8 divisors (see below), whose sum is σ = 985242080. Its totient is φ = 443358900.

The previous prime is 665038291. The next prime is 665038403. The reversal of 665038377 is 773830566.

665038377 is a `hidden beast` number, since 66 + 503 + 83 + 7 + 7 = 666.

It is not a de Polignac number, because 665038377 - 2¹⁰ = 665037353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665038177) 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, 12315499 + ... + 12315552.

It is an arithmetic number, because the mean of its divisors is an integer number (123155260).

Almost surely, 2^665038377 is an apocalyptic number.

It is an amenable number.

665038377 is a deficient number, since it is larger than the sum of its proper divisors (320203703).

665038377 is a wasteful number, since it uses less digits than its factorization.

665038377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24631060 (or 24631054 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 665038377 is about 25788.3380038342. The cubic root of 665038377 is about 872.8686638905.

The spelling of 665038377 in words is "six hundred sixty-five million, thirty-eight thousand, three hundred seventy-seven".