157239392509 has 4 divisors (see below), whose sum is σ = 157422442720. Its totient is φ = 157056342300.

The previous prime is 157239392473. The next prime is 157239392533. The reversal of 157239392509 is 905293932751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157239392509 - 2⁷ = 157239392381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157239392509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157239392549) 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, 91523817 + ... + 91525534.

It is an arithmetic number, because the mean of its divisors is an integer number (39355610680).

Almost surely, 2^157239392509 is an apocalyptic number.

It is an amenable number.

157239392509 is a deficient number, since it is larger than the sum of its proper divisors (183050211).

157239392509 is an equidigital number, since it uses as much as digits as its factorization.

157239392509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183050210.

The product of its (nonzero) digits is 4592700, while the sum is 55.

The spelling of 157239392509 in words is "one hundred fifty-seven billion, two hundred thirty-nine million, three hundred ninety-two thousand, five hundred nine".