68161881 has 8 divisors (see below), whose sum is σ = 93338944. Its totient is φ = 44213040.

The previous prime is 68161879. The next prime is 68161897. The reversal of 68161881 is 18816186.

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

It is not a de Polignac number, because 68161881 - 2¹ = 68161879 is a prime.

It is a super-2 number, since 2×68161881² = 9292084042916322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68161801) 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, 306925 + ... + 307146.

It is an arithmetic number, because the mean of its divisors is an integer number (11667368).

Almost surely, 2^68161881 is an apocalyptic number.

It is an amenable number.

68161881 is a deficient number, since it is larger than the sum of its proper divisors (25177063).

68161881 is a wasteful number, since it uses less digits than its factorization.

68161881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614111.

The product of its digits is 18432, while the sum is 39.

The square root of 68161881 is about 8256.0208938689. The cubic root of 68161881 is about 408.4891468487.

The spelling of 68161881 in words is "sixty-eight million, one hundred sixty-one thousand, eight hundred eighty-one".