79861337820 has 288 divisors, whose sum is σ = 266610839040. Its totient is φ = 19189716480.

The previous prime is 79861337813. The next prime is 79861337837. The reversal of 79861337820 is 2873316897.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 201161862 + ... + 201162258.

It is an arithmetic number, because the mean of its divisors is an integer number (925732080).

Almost surely, 2^79861337820 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 79861337820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133305419520).

79861337820 is an abundant number, since it is smaller than the sum of its proper divisors (186749501220).

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

79861337820 is a wasteful number, since it uses less digits than its factorization.

79861337820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 79861337820 in words is "seventy-nine billion, eight hundred sixty-one million, three hundred thirty-seven thousand, eight hundred twenty".