15644364142 has 16 divisors (see below), whose sum is σ = 25603448112. Its totient is φ = 7110080320.

The previous prime is 15644364139. The next prime is 15644364149. The reversal of 15644364142 is 24146344651.

It is a happy number.

It is a super-2 number, since 2×15644364142² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15644364095 and 15644364104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15644364149) 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, 124818 + ... + 216490.

It is an arithmetic number, because the mean of its divisors is an integer number (1600215507).

Almost surely, 2^15644364142 is an apocalyptic number.

15644364142 is a deficient number, since it is larger than the sum of its proper divisors (9959083970).

15644364142 is a wasteful number, since it uses less digits than its factorization.

15644364142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99443.

The product of its digits is 276480, while the sum is 40.

The spelling of 15644364142 in words is "fifteen billion, six hundred forty-four million, three hundred sixty-four thousand, one hundred forty-two".