79857615961536 has 224 divisors, whose sum is σ = 242067246136320. Its totient is φ = 22760446500864.

The previous prime is 79857615961523. The next prime is 79857615961537. The reversal of 79857615961536 is 63516951675897.

79857615961536 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79857615961537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5317806700 + ... + 5317821716.

Almost surely, 2^{79857615961536} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79857615961536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121033623068160).

79857615961536 is an abundant number, since it is smaller than the sum of its proper divisors (162209630174784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79857615961536 is a wasteful number, since it uses less digits than its factorization.

79857615961536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24491 (or 24481 counting only the distinct ones).

The product of its digits is 2571912000, while the sum is 78.

The spelling of 79857615961536 in words is "seventy-nine trillion, eight hundred fifty-seven billion, six hundred fifteen million, nine hundred sixty-one thousand, five hundred thirty-six".