157445715721 has 8 divisors (see below), whose sum is σ = 179956884800. Its totient is φ = 134939277648.

The previous prime is 157445715701. The next prime is 157445715787. The reversal of 157445715721 is 127517544751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157445715721 - 2⁵ = 157445715689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157445715701) 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, 1111146 + ... + 1244803.

It is an arithmetic number, because the mean of its divisors is an integer number (22494610600).

Almost surely, 2^157445715721 is an apocalyptic number.

It is an amenable number.

157445715721 is a deficient number, since it is larger than the sum of its proper divisors (22511169079).

157445715721 is an equidigital number, since it uses as much as digits as its factorization.

157445715721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365503.

The product of its digits is 1372000, while the sum is 49.

The spelling of 157445715721 in words is "one hundred fifty-seven billion, four hundred forty-five million, seven hundred fifteen thousand, seven hundred twenty-one".