679445018991 has 48 divisors (see below), whose sum is σ = 1024014700800. Its totient is φ = 450186709248.

The previous prime is 679445018981. The next prime is 679445019079. The reversal of 679445018991 is 199810544976.

679445018991 is a `hidden beast` number, since 6 + 7 + 9 + 44 + 501 + 89 + 9 + 1 = 666.

679445018991 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 679445018991 - 2⁶ = 679445018927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679445018911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115568590 + ... + 115574468.

It is an arithmetic number, because the mean of its divisors is an integer number (21333639600).

Almost surely, 2^679445018991 is an apocalyptic number.

679445018991 is a deficient number, since it is larger than the sum of its proper divisors (344569681809).

679445018991 is a wasteful number, since it uses less digits than its factorization.

679445018991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8730 (or 8718 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 679445018991 in words is "six hundred seventy-nine billion, four hundred forty-five million, eighteen thousand, nine hundred ninety-one".