78137954397 has 8 divisors (see below), whose sum is σ = 115759932480. Its totient is φ = 52091969580.

The previous prime is 78137954387. The next prime is 78137954429. The reversal of 78137954397 is 79345973187.

78137954397 is a `hidden beast` number, since 7 + 8 + 13 + 79 + 543 + 9 + 7 = 666.

It is not a de Polignac number, because 78137954397 - 2¹⁰ = 78137953373 is a prime.

It is a super-2 number, since 2×78137954397² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78137954317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1446999129 + ... + 1446999182.

It is an arithmetic number, because the mean of its divisors is an integer number (14469991560).

Almost surely, 2^78137954397 is an apocalyptic number.

It is an amenable number.

78137954397 is a deficient number, since it is larger than the sum of its proper divisors (37621978083).

78137954397 is a wasteful number, since it uses less digits than its factorization.

78137954397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893998320 (or 2893998314 counting only the distinct ones).

The product of its digits is 40007520, while the sum is 63.

The spelling of 78137954397 in words is "seventy-eight billion, one hundred thirty-seven million, nine hundred fifty-four thousand, three hundred ninety-seven".