78811672187 has 4 divisors (see below), whose sum is σ = 80733908136. Its totient is φ = 76889436240.

The previous prime is 78811672139. The next prime is 78811672211. The reversal of 78811672187 is 78127611887.

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

It is a cyclic number.

It is not a de Polignac number, because 78811672187 - 2⁶ = 78811672123 is a prime.

It is a super-2 number, since 2×78811672187² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78813672187) 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, 961117913 + ... + 961117994.

It is an arithmetic number, because the mean of its divisors is an integer number (20183477034).

Almost surely, 2^78811672187 is an apocalyptic number.

78811672187 is a deficient number, since it is larger than the sum of its proper divisors (1922235949).

78811672187 is a wasteful number, since it uses less digits than its factorization.

78811672187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922235948.

The product of its digits is 2107392, while the sum is 56.

The spelling of 78811672187 in words is "seventy-eight billion, eight hundred eleven million, six hundred seventy-two thousand, one hundred eighty-seven".