157257761 has 4 divisors (see below), whose sum is σ = 162330624. Its totient is φ = 152184900.

The previous prime is 157257743. The next prime is 157257781. The reversal of 157257761 is 167752751.

It is a happy number.

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: 167752751 = 12503 ⋅13417.

It is a cyclic number.

It is not a de Polignac number, because 157257761 - 2⁶ = 157257697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157257781) 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, 2536385 + ... + 2536446.

It is an arithmetic number, because the mean of its divisors is an integer number (40582656).

Almost surely, 2^157257761 is an apocalyptic number.

It is an amenable number.

157257761 is a deficient number, since it is larger than the sum of its proper divisors (5072863).

157257761 is an equidigital number, since it uses as much as digits as its factorization.

157257761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072862.

The product of its digits is 102900, while the sum is 41.

The square root of 157257761 is about 12540.2456515014. The cubic root of 157257761 is about 539.7641413965.

The spelling of 157257761 in words is "one hundred fifty-seven million, two hundred fifty-seven thousand, seven hundred sixty-one".