78892551891 has 12 divisors (see below), whose sum is σ = 114787705032. Its totient is φ = 52211128416.

The previous prime is 78892551889. The next prime is 78892551893. The reversal of 78892551891 is 19815529887.

78892551891 is a `hidden beast` number, since 7 + 8 + 8 + 9 + 25 + 518 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (78892551889) and next prime (78892551893).

It is not a de Polignac number, because 78892551891 - 2¹ = 78892551889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78892551893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31990881 + ... + 31993346.

It is an arithmetic number, because the mean of its divisors is an integer number (9565642086).

Almost surely, 2^78892551891 is an apocalyptic number.

78892551891 is a deficient number, since it is larger than the sum of its proper divisors (35895153141).

78892551891 is a wasteful number, since it uses less digits than its factorization.

78892551891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63984370 (or 63984367 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 63.

The spelling of 78892551891 in words is "seventy-eight billion, eight hundred ninety-two million, five hundred fifty-one thousand, eight hundred ninety-one".