8161517425 has 12 divisors (see below), whose sum is σ = 10121834800. Its totient is φ = 6528211920.

The previous prime is 8161517423. The next prime is 8161517443. The reversal of 8161517425 is 5247151618.

It is not a de Polignac number, because 8161517425 - 2¹ = 8161517423 is a prime.

It is a super-2 number, since 2×8161517425² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8161517423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171274 + ... + 213676.

Almost surely, 2^8161517425 is an apocalyptic number.

It is an amenable number.

8161517425 is a deficient number, since it is larger than the sum of its proper divisors (1960317375).

8161517425 is a wasteful number, since it uses less digits than its factorization.

8161517425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50112 (or 50107 counting only the distinct ones).

The product of its digits is 67200, while the sum is 40.

The square root of 8161517425 is about 90341.1170232027. The cubic root of 8161517425 is about 2013.3702050510.

The spelling of 8161517425 in words is "eight billion, one hundred sixty-one million, five hundred seventeen thousand, four hundred twenty-five".