76818161 has 4 divisors (see below), whose sum is σ = 87792192. Its totient is φ = 65844132.

The previous prime is 76818103. The next prime is 76818173. The reversal of 76818161 is 16181867.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16181867 = 13 ⋅1244759.

It is a cyclic number.

It is not a de Polignac number, because 76818161 - 2¹⁸ = 76556017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (76818101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5487005 + ... + 5487018.

It is an arithmetic number, because the mean of its divisors is an integer number (21948048).

Almost surely, 2^76818161 is an apocalyptic number.

It is an amenable number.

76818161 is a deficient number, since it is larger than the sum of its proper divisors (10974031).

76818161 is a wasteful number, since it uses less digits than its factorization.

76818161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10974030.

The product of its digits is 16128, while the sum is 38.

The square root of 76818161 is about 8764.5970243931. The cubic root of 76818161 is about 425.0969301405.

The spelling of 76818161 in words is "seventy-six million, eight hundred eighteen thousand, one hundred sixty-one".