679894494945 has 32 divisors (see below), whose sum is σ = 1136656392192. Its totient is φ = 346377780672.

The previous prime is 679894494941. The next prime is 679894494977. The reversal of 679894494945 is 549494498976.

It is not a de Polignac number, because 679894494945 - 2² = 679894494941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (679894494941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1069849 + ... + 1582518.

It is an arithmetic number, because the mean of its divisors is an integer number (35520512256).

Almost surely, 2^679894494945 is an apocalyptic number.

It is an amenable number.

679894494945 is a deficient number, since it is larger than the sum of its proper divisors (456761897247).

679894494945 is a wasteful number, since it uses less digits than its factorization.

679894494945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653141.

The product of its digits is 2821754880, while the sum is 78.

The spelling of 679894494945 in words is "six hundred seventy-nine billion, eight hundred ninety-four million, four hundred ninety-four thousand, nine hundred forty-five".