15491785156 has 9 divisors (see below), whose sum is σ = 27111059661. Its totient is φ = 7745768112.

The previous prime is 15491785087. The next prime is 15491785159. The reversal of 15491785156 is 65158719451.

The square root of 15491785156 is 124466.

It is a perfect power (a square), and thus also a powerful number.

15491785156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 14774402500 + 717382656 = 121550^2 + 26784^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15491785159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 217816 + ... + 280048.

Almost surely, 2^15491785156 is an apocalyptic number.

15491785156 is the 124466-th square number.

It is an amenable number.

15491785156 is a deficient number, since it is larger than the sum of its proper divisors (11619274505).

15491785156 is an frugal number, since it uses more digits than its factorization.

15491785156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124470 (or 62235 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 52.

The spelling of 15491785156 in words is "fifteen billion, four hundred ninety-one million, seven hundred eighty-five thousand, one hundred fifty-six".