15646613994 has 96 divisors (see below), whose sum is σ = 38878991424. Its totient is φ = 4676330880.

The previous prime is 15646613989. The next prime is 15646614001. The reversal of 15646613994 is 49931664651.

It is a happy number.

15646613994 is a `hidden beast` number, since 1 + 564 + 66 + 13 + 9 + 9 + 4 = 666.

15646613994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 15646613994.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 370212 + ... + 410304.

It is an arithmetic number, because the mean of its divisors is an integer number (404989494).

Almost surely, 2^15646613994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15646613994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19439495712).

15646613994 is an abundant number, since it is smaller than the sum of its proper divisors (23232377430).

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

15646613994 is a wasteful number, since it uses less digits than its factorization.

15646613994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40194 (or 40182 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The spelling of 15646613994 in words is "fifteen billion, six hundred forty-six million, six hundred thirteen thousand, nine hundred ninety-four".