665634370 has 32 divisors (see below), whose sum is σ = 1216228608. Its totient is φ = 262261248.

The previous prime is 665634331. The next prime is 665634373. The reversal of 665634370 is 73436566.

It is a super-2 number, since 2×665634370² = 886138229050593800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665634373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218679 + ... + 221701.

It is an arithmetic number, because the mean of its divisors is an integer number (38007144).

Almost surely, 2^665634370 is an apocalyptic number.

665634370 is a deficient number, since it is larger than the sum of its proper divisors (550594238).

665634370 is a wasteful number, since it uses less digits than its factorization.

665634370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354.

The product of its (nonzero) digits is 272160, while the sum is 40.

The square root of 665634370 is about 25799.8908912422. The cubic root of 665634370 is about 873.1293347052.

The spelling of 665634370 in words is "six hundred sixty-five million, six hundred thirty-four thousand, three hundred seventy".