15680879689 has 2 divisors, whose sum is σ = 15680879690. Its totient is φ = 15680879688.

The previous prime is 15680879603. The next prime is 15680879693. The reversal of 15680879689 is 98697808651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13394127289 + 2286752400 = 115733^2 + 47820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15680879689 is a prime.

It is a super-4 number, since 4×15680879689⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (15680879989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7840439844 + 7840439845.

It is an arithmetic number, because the mean of its divisors is an integer number (7840439845).

Almost surely, 2^15680879689 is an apocalyptic number.

It is an amenable number.

15680879689 is a deficient number, since it is larger than the sum of its proper divisors (1).

15680879689 is an equidigital number, since it uses as much as digits as its factorization.

15680879689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 67.

The spelling of 15680879689 in words is "fifteen billion, six hundred eighty million, eight hundred seventy-nine thousand, six hundred eighty-nine".