15857133907 has 2 divisors, whose sum is σ = 15857133908. Its totient is φ = 15857133906.

The previous prime is 15857133899. The next prime is 15857133913. The reversal of 15857133907 is 70933175851.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15857133907 - 2³ = 15857133899 is a prime.

It is not a weakly prime, because it can be changed into another prime (15857133917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7928566953 + 7928566954.

It is an arithmetic number, because the mean of its divisors is an integer number (7928566954).

Almost surely, 2^15857133907 is an apocalyptic number.

15857133907 is a deficient number, since it is larger than the sum of its proper divisors (1).

15857133907 is an equidigital number, since it uses as much as digits as its factorization.

15857133907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 15857133907 in words is "fifteen billion, eight hundred fifty-seven million, one hundred thirty-three thousand, nine hundred seven".