8161915305 has 32 divisors (see below), whose sum is σ = 14164512768. Its totient is φ = 3997030400.

The previous prime is 8161915301. The next prime is 8161915357. The reversal of 8161915305 is 5035191618.

It is not a de Polignac number, because 8161915305 - 2² = 8161915301 is a prime.

It is a super-2 number, since 2×8161915305² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8161915301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379881 + ... + 400790.

It is an arithmetic number, because the mean of its divisors is an integer number (442641024).

Almost surely, 2^8161915305 is an apocalyptic number.

8161915305 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8161915305 is a deficient number, since it is larger than the sum of its proper divisors (6002597463).

8161915305 is a wasteful number, since it uses less digits than its factorization.

8161915305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780737.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 8161915305 is about 90343.3190944411. The cubic root of 8161915305 is about 2013.4029222806.

The spelling of 8161915305 in words is "eight billion, one hundred sixty-one million, nine hundred fifteen thousand, three hundred five".