664513692794 has 32 divisors (see below), whose sum is σ = 1176454963200. Its totient is φ = 275477883120.

The previous prime is 664513692761. The next prime is 664513692797. The reversal of 664513692794 is 497296315466.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is not an unprimeable number, because it can be changed into a prime (664513692797) 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, 594347 + ... + 1297025.

It is an arithmetic number, because the mean of its divisors is an integer number (36764217600).

Almost surely, 2^664513692794 is an apocalyptic number.

664513692794 is a deficient number, since it is larger than the sum of its proper divisors (511941270406).

664513692794 is a wasteful number, since it uses less digits than its factorization.

664513692794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704898.

The product of its digits is 58786560, while the sum is 62.

The spelling of 664513692794 in words is "six hundred sixty-four billion, five hundred thirteen million, six hundred ninety-two thousand, seven hundred ninety-four".