157732605721 has 2 divisors, whose sum is σ = 157732605722. Its totient is φ = 157732605720.

The previous prime is 157732605697. The next prime is 157732605731. The reversal of 157732605721 is 127506237751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151262655625 + 6469950096 = 388925^2 + 80436^2 .

It is a cyclic number.

It is not a de Polignac number, because 157732605721 - 2⁷ = 157732605593 is a prime.

It is not a weakly prime, because it can be changed into another prime (157732605731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78866302860 + 78866302861.

It is an arithmetic number, because the mean of its divisors is an integer number (78866302861).

Almost surely, 2^157732605721 is an apocalyptic number.

It is an amenable number.

157732605721 is a deficient number, since it is larger than the sum of its proper divisors (1).

157732605721 is an equidigital number, since it uses as much as digits as its factorization.

157732605721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 617400, while the sum is 46.

The spelling of 157732605721 in words is "one hundred fifty-seven billion, seven hundred thirty-two million, six hundred five thousand, seven hundred twenty-one".