97515967138 has 8 divisors (see below), whose sum is σ = 146275285788. Its totient is φ = 48757538544.

The previous prime is 97515967093. The next prime is 97515967139. The reversal of 97515967138 is 83176951579.

It can be written as a sum of positive squares in 2 ways, for example, as 95204953809 + 2311013329 = 308553^2 + 48073^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×97515967138² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (97515967139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265120 + ... + 515092.

Almost surely, 2^97515967138 is an apocalyptic number.

97515967138 is a deficient number, since it is larger than the sum of its proper divisors (48759318650).

97515967138 is a wasteful number, since it uses less digits than its factorization.

97515967138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445028.

The product of its digits is 14288400, while the sum is 61.

The spelling of 97515967138 in words is "ninety-seven billion, five hundred fifteen million, nine hundred sixty-seven thousand, one hundred thirty-eight".