15491314656 has 144 divisors (see below), whose sum is σ = 45642411360. Its totient is φ = 4978068480.

The previous prime is 15491314613. The next prime is 15491314661. The reversal of 15491314656 is 65641319451.

15491314656 is a `hidden beast` number, since 1 + 54 + 9 + 131 + 465 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8459661 + ... + 8461491.

It is an arithmetic number, because the mean of its divisors is an integer number (316961190).

Almost surely, 2^15491314656 is an apocalyptic number.

15491314656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15491314656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22821205680).

15491314656 is an abundant number, since it is smaller than the sum of its proper divisors (30151096704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15491314656 is a wasteful number, since it uses less digits than its factorization.

15491314656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889 (or 2878 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The spelling of 15491314656 in words is "fifteen billion, four hundred ninety-one million, three hundred fourteen thousand, six hundred fifty-six".