7987666667897 has 16 divisors (see below), whose sum is σ = 9274437860352. Its totient is φ = 6737522386320.

The previous prime is 7987666667867. The next prime is 7987666667951.

7987666667897 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 7987666667897 - 2²⁶ = 7987599559033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7987666667837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8201879 + ... + 9123932.

It is an arithmetic number, because the mean of its divisors is an integer number (579652366272).

Almost surely, 2^{7987666667897} is an apocalyptic number.

It is an amenable number.

7987666667897 is a deficient number, since it is larger than the sum of its proper divisors (1286771192455).

7987666667897 is a wasteful number, since it uses less digits than its factorization.

7987666667897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17326868.

The product of its digits is 96786192384, while the sum is 92.

The spelling of 7987666667897 in words is "seven trillion, nine hundred eighty-seven billion, six hundred sixty-six million, six hundred sixty-seven thousand, eight hundred ninety-seven".