65946881 has 16 divisors (see below), whose sum is σ = 88545408. Its totient is φ = 47433600.

The previous prime is 65946871. The next prime is 65946919. The reversal of 65946881 is 18864956.

It is a cyclic number.

It is not a de Polignac number, because 65946881 - 2⁶ = 65946817 is a prime.

It is a super-2 number, since 2×65946881² = 8697982227256322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65946871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31940 + ... + 33941.

It is an arithmetic number, because the mean of its divisors is an integer number (5534088).

Almost surely, 2^65946881 is an apocalyptic number.

It is an amenable number.

65946881 is a deficient number, since it is larger than the sum of its proper divisors (22598527).

65946881 is a wasteful number, since it uses less digits than its factorization.

65946881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65912.

The product of its digits is 414720, while the sum is 47.

The square root of 65946881 is about 8120.7684981164. The cubic root of 65946881 is about 404.0155554740.

The spelling of 65946881 in words is "sixty-five million, nine hundred forty-six thousand, eight hundred eighty-one".