8157851109 has 6 divisors (see below), whose sum is σ = 11783562726. Its totient is φ = 5438567400.

The previous prime is 8157851099. The next prime is 8157851111. The reversal of 8157851109 is 9011587518.

8157851109 is a `hidden beast` number, since 81 + 57 + 8 + 511 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8094600900 + 63250209 = 89970^2 + 7953^2 .

It is not a de Polignac number, because 8157851109 - 2⁸ = 8157850853 is a prime.

It is a super-2 number, since 2×8157851109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8157851189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 453213942 + ... + 453213959.

It is an arithmetic number, because the mean of its divisors is an integer number (1963927121).

Almost surely, 2^8157851109 is an apocalyptic number.

It is an amenable number.

8157851109 is a deficient number, since it is larger than the sum of its proper divisors (3625711617).

8157851109 is a wasteful number, since it uses less digits than its factorization.

8157851109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906427907 (or 906427904 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 45.

The square root of 8157851109 is about 90320.8232303050. The cubic root of 8157851109 is about 2013.0686779118.

The spelling of 8157851109 in words is "eight billion, one hundred fifty-seven million, eight hundred fifty-one thousand, one hundred nine".