20151105157 has 2 divisors, whose sum is σ = 20151105158. Its totient is φ = 20151105156.

The previous prime is 20151105011. The next prime is 20151105209. The reversal of 20151105157 is 75150115102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19586282401 + 564822756 = 139951^2 + 23766^2 .

It is a cyclic number.

It is not a de Polignac number, because 20151105157 - 2²³ = 20142716549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20151105857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10075552578 + 10075552579.

It is an arithmetic number, because the mean of its divisors is an integer number (10075552579).

Almost surely, 2^20151105157 is an apocalyptic number.

It is an amenable number.

20151105157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20151105157 is an equidigital number, since it uses as much as digits as its factorization.

20151105157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 28.

The spelling of 20151105157 in words is "twenty billion, one hundred fifty-one million, one hundred five thousand, one hundred fifty-seven".