7985957865 has 16 divisors (see below), whose sum is σ = 12782110848. Its totient is φ = 4257651456.

The previous prime is 7985957851. The next prime is 7985957873. The reversal of 7985957865 is 5687595897.

It is not a de Polignac number, because 7985957865 - 2²¹ = 7983860713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7985957865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51469 + ... + 136458.

It is an arithmetic number, because the mean of its divisors is an integer number (798881928).

Almost surely, 2^7985957865 is an apocalyptic number.

It is an amenable number.

7985957865 is a deficient number, since it is larger than the sum of its proper divisors (4796152983).

7985957865 is a wasteful number, since it uses less digits than its factorization.

7985957865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190768.

The product of its digits is 190512000, while the sum is 69.

The square root of 7985957865 is about 89364.1867025040. The cubic root of 7985957865 is about 1998.8291367567.

The spelling of 7985957865 in words is "seven billion, nine hundred eighty-five million, nine hundred fifty-seven thousand, eight hundred sixty-five".