7997615999 has 12 divisors (see below), whose sum is σ = 8148945168. Its totient is φ = 7849031040.

The previous prime is 7997615987. The next prime is 7997616023. The reversal of 7997615999 is 9995167997.

It is a happy number.

It is not a de Polignac number, because 7997615999 - 2²⁴ = 7980838783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997615909) 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, 1869527 + ... + 1873799.

It is an arithmetic number, because the mean of its divisors is an integer number (679078764).

Almost surely, 2^7997615999 is an apocalyptic number.

7997615999 is a deficient number, since it is larger than the sum of its proper divisors (151329169).

7997615999 is an equidigital number, since it uses as much as digits as its factorization.

7997615999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4898 (or 4837 counting only the distinct ones).

The product of its digits is 86802030, while the sum is 71.

The square root of 7997615999 is about 89429.3911362478. The cubic root of 7997615999 is about 1999.8013135125.

The spelling of 7997615999 in words is "seven billion, nine hundred ninety-seven million, six hundred fifteen thousand, nine hundred ninety-nine".