157725125065657 has 4 divisors (see below), whose sum is σ = 157725151082356. Its totient is φ = 157725099048960.

The previous prime is 157725125065577. The next prime is 157725125065727. The reversal of 157725125065657 is 756560521527751.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50795896511376 + 106929228554281 = 7127124^2 + 10340659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157725125065657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157725125065957) 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, 1419193 + ... + 17817529.

It is an arithmetic number, because the mean of its divisors is an integer number (39431287770589).

Almost surely, 2^{157725125065657} is an apocalyptic number.

It is an amenable number.

157725125065657 is a deficient number, since it is larger than the sum of its proper divisors (26016699).

157725125065657 is an equidigital number, since it uses as much as digits as its factorization.

157725125065657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26016698.

The product of its (nonzero) digits is 154350000, while the sum is 64.

The spelling of 157725125065657 in words is "one hundred fifty-seven trillion, seven hundred twenty-five billion, one hundred twenty-five million, sixty-five thousand, six hundred fifty-seven".