65672881 has 4 divisors (see below), whose sum is σ = 65705200. Its totient is φ = 65640564.

The previous prime is 65672851. The next prime is 65672899. The reversal of 65672881 is 18827656.

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.

It is a cyclic number.

It is not a de Polignac number, because 65672881 - 2⁷ = 65672753 is a prime.

It is a super-2 number, since 2×65672881² = 8625854597680322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65672821) 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, 12891 + ... + 17248.

It is an arithmetic number, because the mean of its divisors is an integer number (16426300).

Almost surely, 2^65672881 is an apocalyptic number.

It is an amenable number.

65672881 is a deficient number, since it is larger than the sum of its proper divisors (32319).

65672881 is a wasteful number, since it uses less digits than its factorization.

65672881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32318.

The product of its digits is 161280, while the sum is 43.

The square root of 65672881 is about 8103.8806136320. The cubic root of 65672881 is about 403.4552361682.

It can be divided in two parts, 656 and 72881, that added together give a palindrome (73537).

The spelling of 65672881 in words is "sixty-five million, six hundred seventy-two thousand, eight hundred eighty-one".