157957389521 has 2 divisors, whose sum is σ = 157957389522. Its totient is φ = 157957389520.

The previous prime is 157957389511. The next prime is 157957389529. The reversal of 157957389521 is 125983759751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154240780225 + 3716609296 = 392735^2 + 60964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157957389521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (157957389529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78978694760 + 78978694761.

It is an arithmetic number, because the mean of its divisors is an integer number (78978694761).

Almost surely, 2^157957389521 is an apocalyptic number.

It is an amenable number.

157957389521 is a deficient number, since it is larger than the sum of its proper divisors (1).

157957389521 is an equidigital number, since it uses as much as digits as its factorization.

157957389521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814000, while the sum is 62.

The spelling of 157957389521 in words is "one hundred fifty-seven billion, nine hundred fifty-seven million, three hundred eighty-nine thousand, five hundred twenty-one".