665614464 has 64 divisors (see below), whose sum is σ = 1872059040. Its totient is φ = 208818176.

The previous prime is 665614451. The next prime is 665614471. The reversal of 665614464 is 464416566.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×665614464² = 886085229372014592, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44454 + ... + 57509.

Almost surely, 2^665614464 is an apocalyptic number.

665614464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

665614464 is an abundant number, since it is smaller than the sum of its proper divisors (1206444576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665614464 is a wasteful number, since it uses less digits than its factorization.

665614464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101997 (or 101985 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 665614464 is about 25799.5051115327. The cubic root of 665614464 is about 873.1206308849.

The spelling of 665614464 in words is "six hundred sixty-five million, six hundred fourteen thousand, four hundred sixty-four".