157609256509 has 2 divisors, whose sum is σ = 157609256510. Its totient is φ = 157609256508.

The previous prime is 157609256489. The next prime is 157609256557. The reversal of 157609256509 is 905652906751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96582965284 + 61026291225 = 310778^2 + 247035^2 .

It is a cyclic number.

It is not a de Polignac number, because 157609256509 - 2⁹ = 157609255997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157609256509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157609256009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78804628254 + 78804628255.

It is an arithmetic number, because the mean of its divisors is an integer number (78804628255).

Almost surely, 2^157609256509 is an apocalyptic number.

It is an amenable number.

157609256509 is a deficient number, since it is larger than the sum of its proper divisors (1).

157609256509 is an equidigital number, since it uses as much as digits as its factorization.

157609256509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103000, while the sum is 55.

The spelling of 157609256509 in words is "one hundred fifty-seven billion, six hundred nine million, two hundred fifty-six thousand, five hundred nine".