79664898578661 has 96 divisors (see below), whose sum is σ = 129328975181952. Its totient is φ = 46842766663680.

The previous prime is 79664898578599. The next prime is 79664898578687. The reversal of 79664898578661 is 16687589846697.

It is a happy number.

79664898578661 is a `hidden beast` number, since 7 + 9 + 66 + 489 + 8 + 5 + 7 + 8 + 6 + 61 = 666.

It is not a de Polignac number, because 79664898578661 - 2¹³ = 79664898570469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79664898576661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 607122486 + ... + 607253688.

It is an arithmetic number, because the mean of its divisors is an integer number (1347176824812).

Almost surely, 2^{79664898578661} is an apocalyptic number.

It is an amenable number.

79664898578661 is a deficient number, since it is larger than the sum of its proper divisors (49664076603291).

79664898578661 is a wasteful number, since it uses less digits than its factorization.

79664898578661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132563 (or 132560 counting only the distinct ones).

The product of its digits is 52672757760, while the sum is 90.

The spelling of 79664898578661 in words is "seventy-nine trillion, six hundred sixty-four billion, eight hundred ninety-eight million, five hundred seventy-eight thousand, six hundred sixty-one".