78316987157 has 8 divisors (see below), whose sum is σ = 78519652992. Its totient is φ = 78114419200.

The previous prime is 78316987153. The next prime is 78316987181. The reversal of 78316987157 is 75178961387.

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

It is a cyclic number.

It is not a de Polignac number, because 78316987157 - 2² = 78316987153 is a prime.

It is a super-2 number, since 2×78316987157² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78316987157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78316987153) 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, 1741013 + ... + 1785429.

It is an arithmetic number, because the mean of its divisors is an integer number (9814956624).

Almost surely, 2^78316987157 is an apocalyptic number.

It is an amenable number.

78316987157 is a deficient number, since it is larger than the sum of its proper divisors (202665835).

78316987157 is a wasteful number, since it uses less digits than its factorization.

78316987157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48939.

The product of its digits is 17781120, while the sum is 62.

The spelling of 78316987157 in words is "seventy-eight billion, three hundred sixteen million, nine hundred eighty-seven thousand, one hundred fifty-seven".