15782971879 has 4 divisors (see below), whose sum is σ = 15785058640. Its totient is φ = 15780885120.

The previous prime is 15782971873. The next prime is 15782971993. The reversal of 15782971879 is 97817928751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97817928751 = 1709 ⋅57236939.

It is a cyclic number.

It is not a de Polignac number, because 15782971879 - 2⁹ = 15782971367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15782971879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15782971873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031994 + ... + 1047175.

It is an arithmetic number, because the mean of its divisors is an integer number (3946264660).

Almost surely, 2^15782971879 is an apocalyptic number.

15782971879 is a deficient number, since it is larger than the sum of its proper divisors (2086761).

15782971879 is an equidigital number, since it uses as much as digits as its factorization.

15782971879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086760.

The product of its digits is 17781120, while the sum is 64.

The spelling of 15782971879 in words is "fifteen billion, seven hundred eighty-two million, nine hundred seventy-one thousand, eight hundred seventy-nine".