157235128657 has 4 divisors (see below), whose sum is σ = 160891759600. Its totient is φ = 153578497716.

The previous prime is 157235128637. The next prime is 157235128709. The reversal of 157235128657 is 756821532751.

157235128657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 756821532751 = 32803 ⋅23071717.

It is a cyclic number.

It is not a de Polignac number, because 157235128657 - 2¹⁵ = 157235095889 is a prime.

It is a super-3 number, since 3×157235128657³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157235128607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828315407 + ... + 1828315492.

It is an arithmetic number, because the mean of its divisors is an integer number (40222939900).

Almost surely, 2^157235128657 is an apocalyptic number.

It is an amenable number.

157235128657 is a deficient number, since it is larger than the sum of its proper divisors (3656630943).

157235128657 is an equidigital number, since it uses as much as digits as its factorization.

157235128657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656630942.

The product of its digits is 3528000, while the sum is 52.

The spelling of 157235128657 in words is "one hundred fifty-seven billion, two hundred thirty-five million, one hundred twenty-eight thousand, six hundred fifty-seven".