157620611209 has 2 divisors, whose sum is σ = 157620611210. Its totient is φ = 157620611208.

The previous prime is 157620611201. The next prime is 157620611231. The reversal of 157620611209 is 902116026751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140004685584 + 17615925625 = 374172^2 + 132725^2 .

It is a cyclic number.

It is not a de Polignac number, because 157620611209 - 2³ = 157620611201 is a prime.

It is not a weakly prime, because it can be changed into another prime (157620611201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78810305604 + 78810305605.

It is an arithmetic number, because the mean of its divisors is an integer number (78810305605).

Almost surely, 2^157620611209 is an apocalyptic number.

It is an amenable number.

157620611209 is a deficient number, since it is larger than the sum of its proper divisors (1).

157620611209 is an equidigital number, since it uses as much as digits as its factorization.

157620611209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 157620611209 in words is "one hundred fifty-seven billion, six hundred twenty million, six hundred eleven thousand, two hundred nine".