15744368641 has 32 divisors (see below), whose sum is σ = 16936128000. Its totient is φ = 14604226560.

The previous prime is 15744368623. The next prime is 15744368657. The reversal of 15744368641 is 14686344751.

It is a 4-Lehmer number, since φ(15744368641) divides (15744368641-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 15744368641 - 2⁵ = 15744368609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15744363641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35065185 + ... + 35065633.

It is an arithmetic number, because the mean of its divisors is an integer number (529254000).

It is a Proth number, since it is equal to 15015 ⋅ 2²⁰ + 1 and 15015 < 2²⁰.

Almost surely, 2^15744368641 is an apocalyptic number.

It is an amenable number.

15744368641 is a deficient number, since it is larger than the sum of its proper divisors (1191759359).

15744368641 is a wasteful number, since it uses less digits than its factorization.

15744368641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its digits is 1935360, while the sum is 49.

The spelling of 15744368641 in words is "fifteen billion, seven hundred forty-four million, three hundred sixty-eight thousand, six hundred forty-one".