157620534809 has 2 divisors, whose sum is σ = 157620534810. Its totient is φ = 157620534808.

The previous prime is 157620534779. The next prime is 157620534817. The reversal of 157620534809 is 908435026751.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157295526025 + 325008784 = 396605^2 + 18028^2 .

It is a cyclic number.

It is not a de Polignac number, because 157620534809 - 2⁸ = 157620534553 is a prime.

It is not a weakly prime, because it can be changed into another prime (157620534829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78810267404 + 78810267405.

It is an arithmetic number, because the mean of its divisors is an integer number (78810267405).

It is a 1-persistent number, because it is pandigital, but 2⋅157620534809 = 315241069618 is not.

Almost surely, 2^157620534809 is an apocalyptic number.

It is an amenable number.

157620534809 is a deficient number, since it is larger than the sum of its proper divisors (1).

157620534809 is an equidigital number, since it uses as much as digits as its factorization.

157620534809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 157620534809 in words is "one hundred fifty-seven billion, six hundred twenty million, five hundred thirty-four thousand, eight hundred nine".