15642093791 has 4 divisors (see below), whose sum is σ = 15678386784. Its totient is φ = 15605800800.

The previous prime is 15642093751. The next prime is 15642093809. The reversal of 15642093791 is 19739024651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15642093791 - 2²⁶ = 15574984927 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 (15642093751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18145850 + ... + 18146711.

It is an arithmetic number, because the mean of its divisors is an integer number (3919596696).

Almost surely, 2^15642093791 is an apocalyptic number.

15642093791 is a deficient number, since it is larger than the sum of its proper divisors (36292993).

15642093791 is an equidigital number, since it uses as much as digits as its factorization.

15642093791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36292992.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 15642093791 in words is "fifteen billion, six hundred forty-two million, ninety-three thousand, seven hundred ninety-one".