664633408465 has 16 divisors (see below), whose sum is σ = 859970010816. Its totient is φ = 490200984000.

The previous prime is 664633408429. The next prime is 664633408477. The reversal of 664633408465 is 564804336466.

It is not a de Polignac number, because 664633408465 - 2¹¹ = 664633406417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6251311 + ... + 6356740.

It is an arithmetic number, because the mean of its divisors is an integer number (53748125676).

Almost surely, 2^664633408465 is an apocalyptic number.

664633408465 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

664633408465 is a deficient number, since it is larger than the sum of its proper divisors (195336602351).

664633408465 is a wasteful number, since it uses less digits than its factorization.

664633408465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12608880.

The product of its (nonzero) digits is 29859840, while the sum is 55.

The spelling of 664633408465 in words is "six hundred sixty-four billion, six hundred thirty-three million, four hundred eight thousand, four hundred sixty-five".