97979181858 has 24 divisors (see below), whose sum is σ = 212306333148. Its totient is φ = 32656941792.

The previous prime is 97979181857. The next prime is 97979181869. The reversal of 97979181858 is 85818197979.

It can be written as a sum of positive squares in 2 ways, for example, as 53918233209 + 44060948649 = 232203^2 + 209907^2 .

It is not an unprimeable number, because it can be changed into a prime (97979181851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9441 + ... + 442772.

Almost surely, 2^97979181858 is an apocalyptic number.

97979181858 is an abundant number, since it is smaller than the sum of its proper divisors (114327151290).

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

97979181858 is a wasteful number, since it uses less digits than its factorization.

97979181858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464258 (or 464255 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 72.

The spelling of 97979181858 in words is "ninety-seven billion, nine hundred seventy-nine million, one hundred eighty-one thousand, eight hundred fifty-eight".