2115355257 has 10 divisors (see below), whose sum is σ = 3159975258. Its totient is φ = 1410236784.

The previous prime is 2115355247. The next prime is 2115355259. The reversal of 2115355257 is 7525535112.

2115355257 is a `hidden beast` number, since 2 + 1 + 1 + 53 + 552 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1687237776 + 428117481 = 41076^2 + 20691^2 .

It is not a de Polignac number, because 2115355257 - 2⁸ = 2115355001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2115355259) 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 in 9 ways as a sum of consecutive naturals, for example, 13057668 + ... + 13057829.

Almost surely, 2^2115355257 is an apocalyptic number.

2115355257 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2115355257 is a deficient number, since it is larger than the sum of its proper divisors (1044620001).

2115355257 is an equidigital number, since it uses as much as digits as its factorization.

2115355257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26115509 (or 26115500 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 2115355257 is about 45992.9913899933. The cubic root of 2115355257 is about 1283.6927981548.

The spelling of 2115355257 in words is "two billion, one hundred fifteen million, three hundred fifty-five thousand, two hundred fifty-seven".