997196639198 has 16 divisors (see below), whose sum is σ = 1575266295120. Its totient is φ = 472132717056.

The previous prime is 997196639149. The next prime is 997196639221. The reversal of 997196639198 is 891936691799.

It is a super-2 number, since 2×997196639198² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6129365 + ... + 6289952.

It is an arithmetic number, because the mean of its divisors is an integer number (98454143445).

Almost surely, 2^997196639198 is an apocalyptic number.

997196639198 is a deficient number, since it is larger than the sum of its proper divisors (578069655922).

997196639198 is a wasteful number, since it uses less digits than its factorization.

997196639198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12421451.

The product of its digits is 357128352, while the sum is 77.

The spelling of 997196639198 in words is "nine hundred ninety-seven billion, one hundred ninety-six million, six hundred thirty-nine thousand, one hundred ninety-eight".