7878976851 has 4 divisors (see below), whose sum is σ = 10505302472. Its totient is φ = 5252651232.

The previous prime is 7878976849. The next prime is 7878976871. The reversal of 7878976851 is 1586798787.

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

It is not a de Polignac number, because 7878976851 - 2¹ = 7878976849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7878976871) 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, 1313162806 + ... + 1313162811.

It is an arithmetic number, because the mean of its divisors is an integer number (2626325618).

Almost surely, 2^7878976851 is an apocalyptic number.

7878976851 is a deficient number, since it is larger than the sum of its proper divisors (2626325621).

7878976851 is a wasteful number, since it uses less digits than its factorization.

7878976851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626325620.

The product of its digits is 47416320, while the sum is 66.

The square root of 7878976851 is about 88763.6009352933. The cubic root of 7878976851 is about 1989.8634495497.

The spelling of 7878976851 in words is "seven billion, eight hundred seventy-eight million, nine hundred seventy-six thousand, eight hundred fifty-one".