7816765257 has 96 divisors (see below), whose sum is σ = 14330953728. Its totient is φ = 4000347648.

The previous prime is 7816765249. The next prime is 7816765259. The reversal of 7816765257 is 7525676187.

It is a happy number.

7816765257 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7816765257 - 2³ = 7816765249 is a prime.

It is a super-2 number, since 2×7816765257² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7816765259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5492448 + ... + 5493870.

It is an arithmetic number, because the mean of its divisors is an integer number (149280768).

Almost surely, 2^7816765257 is an apocalyptic number.

It is an amenable number.

7816765257 is a deficient number, since it is larger than the sum of its proper divisors (6514188471).

7816765257 is a wasteful number, since it uses less digits than its factorization.

7816765257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699 (or 1696 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 54.

The square root of 7816765257 is about 88412.4722932234. The cubic root of 7816765257 is about 1984.6123518491.

The spelling of 7816765257 in words is "seven billion, eight hundred sixteen million, seven hundred sixty-five thousand, two hundred fifty-seven".