9979157694 has 128 divisors (see below), whose sum is σ = 24115968000. Its totient is φ = 2718576000.

The previous prime is 9979157677. The next prime is 9979157701. The reversal of 9979157694 is 4967519799.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2143269 + ... + 2147919.

It is an arithmetic number, because the mean of its divisors is an integer number (188406000).

Almost surely, 2^9979157694 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9979157694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12057984000).

9979157694 is an abundant number, since it is smaller than the sum of its proper divisors (14136810306).

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

9979157694 is a wasteful number, since it uses less digits than its factorization.

9979157694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774.

The product of its digits is 38578680, while the sum is 66.

The square root of 9979157694 is about 99895.7341131242. The cubic root of 9979157694 is about 2152.9368693793.

The spelling of 9979157694 in words is "nine billion, nine hundred seventy-nine million, one hundred fifty-seven thousand, six hundred ninety-four".