665697914 has 32 divisors (see below), whose sum is σ = 1165777920. Its totient is φ = 279182592.

The previous prime is 665697913. The next prime is 665697919. The reversal of 665697914 is 419796566.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (665697913) 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, 354482 + ... + 356354.

It is an arithmetic number, because the mean of its divisors is an integer number (36430560).

Almost surely, 2^665697914 is an apocalyptic number.

665697914 is a deficient number, since it is larger than the sum of its proper divisors (500080006).

665697914 is a wasteful number, since it uses less digits than its factorization.

665697914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414.

The product of its digits is 2449440, while the sum is 53.

The square root of 665697914 is about 25801.1223399293. The cubic root of 665697914 is about 873.1571179085.

The spelling of 665697914 in words is "six hundred sixty-five million, six hundred ninety-seven thousand, nine hundred fourteen".