15644122013 has 8 divisors (see below), whose sum is σ = 17239319328. Its totient is φ = 14104896624.

The previous prime is 15644122009. The next prime is 15644122031. The reversal of 15644122013 is 31022144651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15644122013 - 2² = 15644122009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15644121013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13992395 + ... + 13993512.

It is an arithmetic number, because the mean of its divisors is an integer number (2154914916).

Almost surely, 2^15644122013 is an apocalyptic number.

15644122013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

15644122013 is a deficient number, since it is larger than the sum of its proper divisors (1595197315).

15644122013 is a wasteful number, since it uses less digits than its factorization.

15644122013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27985963.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 15644122013 its reverse (31022144651), we get a palindrome (46666266664).

The spelling of 15644122013 in words is "fifteen billion, six hundred forty-four million, one hundred twenty-two thousand, thirteen".