7977751893 has 6 divisors (see below), whose sum is σ = 11523419414. Its totient is φ = 5318501256.

The previous prime is 7977751883. The next prime is 7977751909. The reversal of 7977751893 is 3981577797.

It can be written as a sum of positive squares in only one way, i.e., 7681120164 + 296631729 = 87642^2 + 17223^2 .

It is not a de Polignac number, because 7977751893 - 2⁴ = 7977751877 is a prime.

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 7977751893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977751883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 443208430 + ... + 443208447.

Almost surely, 2^7977751893 is an apocalyptic number.

It is an amenable number.

7977751893 is a deficient number, since it is larger than the sum of its proper divisors (3545667521).

7977751893 is a wasteful number, since it uses less digits than its factorization.

7977751893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886416883 (or 886416880 counting only the distinct ones).

The product of its digits is 23337720, while the sum is 63.

The square root of 7977751893 is about 89318.2618113452. The cubic root of 7977751893 is about 1998.1442697485.

The spelling of 7977751893 in words is "seven billion, nine hundred seventy-seven million, seven hundred fifty-one thousand, eight hundred ninety-three".