157907923909 has 2 divisors, whose sum is σ = 157907923910. Its totient is φ = 157907923908.

The previous prime is 157907923883. The next prime is 157907923963. The reversal of 157907923909 is 909329709751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150197327809 + 7710596100 = 387553^2 + 87810^2 .

It is a cyclic number.

It is not a de Polignac number, because 157907923909 - 2³⁷ = 20468970437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157907923109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78953961954 + 78953961955.

It is an arithmetic number, because the mean of its divisors is an integer number (78953961955).

Almost surely, 2^157907923909 is an apocalyptic number.

It is an amenable number.

157907923909 is a deficient number, since it is larger than the sum of its proper divisors (1).

157907923909 is an equidigital number, since it uses as much as digits as its factorization.

157907923909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9644670, while the sum is 61.

The spelling of 157907923909 in words is "one hundred fifty-seven billion, nine hundred seven million, nine hundred twenty-three thousand, nine hundred nine".