79818522538 has 4 divisors (see below), whose sum is σ = 119727783810. Its totient is φ = 39909261268.

The previous prime is 79818522523. The next prime is 79818522551. The reversal of 79818522538 is 83522581897.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75747699729 + 4070822809 = 275223^2 + 63803^2 .

It is a super-2 number, since 2×79818522538² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19954630633 + ... + 19954630636.

Almost surely, 2^79818522538 is an apocalyptic number.

79818522538 is a deficient number, since it is larger than the sum of its proper divisors (39909261272).

79818522538 is a wasteful number, since it uses less digits than its factorization.

79818522538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39909261271.

The product of its digits is 9676800, while the sum is 58.

The spelling of 79818522538 in words is "seventy-nine billion, eight hundred eighteen million, five hundred twenty-two thousand, five hundred thirty-eight".