15994891279 has 2 divisors, whose sum is σ = 15994891280. Its totient is φ = 15994891278.

The previous prime is 15994891273. The next prime is 15994891349. The reversal of 15994891279 is 97219849951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15994891279 - 2³ = 15994891271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15994891279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15994891271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7997445639 + 7997445640.

It is an arithmetic number, because the mean of its divisors is an integer number (7997445640).

Almost surely, 2^15994891279 is an apocalyptic number.

15994891279 is a deficient number, since it is larger than the sum of its proper divisors (1).

15994891279 is an equidigital number, since it uses as much as digits as its factorization.

15994891279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 64.

The spelling of 15994891279 in words is "fifteen billion, nine hundred ninety-four million, eight hundred ninety-one thousand, two hundred seventy-nine".