8161677681 has 8 divisors (see below), whose sum is σ = 10927770240. Its totient is φ = 5418351792.

The previous prime is 8161677659. The next prime is 8161677691. The reversal of 8161677681 is 1867761618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8161677681 - 2⁵ = 8161677649 is a prime.

It is a super-2 number, since 2×8161677681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8161677631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5690830 + ... + 5692263.

It is an arithmetic number, because the mean of its divisors is an integer number (1365971280).

Almost surely, 2^8161677681 is an apocalyptic number.

It is an amenable number.

8161677681 is a deficient number, since it is larger than the sum of its proper divisors (2766092559).

8161677681 is a wasteful number, since it uses less digits than its factorization.

8161677681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11383335.

The product of its digits is 677376, while the sum is 51.

The square root of 8161677681 is about 90342.0039682539. The cubic root of 8161677681 is about 2013.3833828514.

The spelling of 8161677681 in words is "eight billion, one hundred sixty-one million, six hundred seventy-seven thousand, six hundred eighty-one".