7678771551 has 24 divisors (see below), whose sum is σ = 12395008080. Its totient is φ = 4540291200.

The previous prime is 7678771487. The next prime is 7678771553. The reversal of 7678771551 is 1551778767.

7678771551 is a `hidden beast` number, since 7 + 6 + 7 + 87 + 7 + 1 + 551 = 666.

It is not a de Polignac number, because 7678771551 - 2⁶ = 7678771487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7678771553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 941836 + ... + 949953.

It is an arithmetic number, because the mean of its divisors is an integer number (516458670).

Almost surely, 2^7678771551 is an apocalyptic number.

7678771551 is a deficient number, since it is larger than the sum of its proper divisors (4716236529).

7678771551 is a wasteful number, since it uses less digits than its factorization.

7678771551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891847 (or 1891844 counting only the distinct ones).

The product of its digits is 2881200, while the sum is 54.

The square root of 7678771551 is about 87628.6000744049. The cubic root of 7678771551 is about 1972.8644588635.

The spelling of 7678771551 in words is "seven billion, six hundred seventy-eight million, seven hundred seventy-one thousand, five hundred fifty-one".