15500972782 has 4 divisors (see below), whose sum is σ = 23251459176. Its totient is φ = 7750486390.

The previous prime is 15500972779. The next prime is 15500972791. The reversal of 15500972782 is 28727900551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3875243194 + ... + 3875243197.

It is an arithmetic number, because the mean of its divisors is an integer number (5812864794).

Almost surely, 2^15500972782 is an apocalyptic number.

15500972782 is a deficient number, since it is larger than the sum of its proper divisors (7750486394).

15500972782 is an equidigital number, since it uses as much as digits as its factorization.

15500972782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7750486393.

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 15500972782 in words is "fifteen billion, five hundred million, nine hundred seventy-two thousand, seven hundred eighty-two".