7985156515897 has 12 divisors (see below), whose sum is σ = 8796620970900. Its totient is φ = 7243065589760.

The previous prime is 7985156515883. The next prime is 7985156516063.

7985156515897 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 2283133088016 + 5702023427881 = 1511004^2 + 2387891^2 .

It is not a de Polignac number, because 7985156515897 - 2¹¹ = 7985156513849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7985156515097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73434568 + ... + 73543225.

It is an arithmetic number, because the mean of its divisors is an integer number (733051747575).

Almost surely, 2^{7985156515897} is an apocalyptic number.

It is an amenable number.

7985156515897 is a deficient number, since it is larger than the sum of its proper divisors (811464455003).

7985156515897 is a wasteful number, since it uses less digits than its factorization.

7985156515897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146978264 (or 146978253 counting only the distinct ones).

The product of its digits is 952560000, while the sum is 76.

The spelling of 7985156515897 in words is "seven trillion, nine hundred eighty-five billion, one hundred fifty-six million, five hundred fifteen thousand, eight hundred ninety-seven".