9497979975978 has 144 divisors (see below), whose sum is σ = 22960544312160. Its totient is φ = 2820695088960.

The previous prime is 9497979975959. The next prime is 9497979975997. The reversal of 9497979975978 is 8795799797949.

It is an interprime number because it is at equal distance from previous prime (9497979975959) and next prime (9497979975997).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 85171525 + ... + 85282967.

It is an arithmetic number, because the mean of its divisors is an integer number (159448224390).

Almost surely, 2^{9497979975978} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9497979975978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11480272156080).

9497979975978 is an abundant number, since it is smaller than the sum of its proper divisors (13462564336182).

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

9497979975978 is a wasteful number, since it uses less digits than its factorization.

9497979975978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111905 (or 111871 counting only the distinct ones).

The product of its digits is 204158374560, while the sum is 99.

The spelling of 9497979975978 in words is "nine trillion, four hundred ninety-seven billion, nine hundred seventy-nine million, nine hundred seventy-five thousand, nine hundred seventy-eight".