15742399668 has 12 divisors (see below), whose sum is σ = 36732265920. Its totient is φ = 5247466552.

The previous prime is 15742399639. The next prime is 15742399697. The reversal of 15742399668 is 86699324751.

It is an interprime number because it is at equal distance from previous prime (15742399639) and next prime (15742399697).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655933308 + ... + 655933331.

It is an arithmetic number, because the mean of its divisors is an integer number (3061022160).

Almost surely, 2^15742399668 is an apocalyptic number.

It is an amenable number.

15742399668 is an abundant number, since it is smaller than the sum of its proper divisors (20989866252).

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

15742399668 is a wasteful number, since it uses less digits than its factorization.

15742399668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311866646 (or 1311866644 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 60.

The spelling of 15742399668 in words is "fifteen billion, seven hundred forty-two million, three hundred ninety-nine thousand, six hundred sixty-eight".