65978166 has 16 divisors (see below), whose sum is σ = 134193600. Its totient is φ = 21619848.

The previous prime is 65978131. The next prime is 65978167. The reversal of 65978166 is 66187956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65978167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92836 + ... + 93543.

It is an arithmetic number, because the mean of its divisors is an integer number (8387100).

Almost surely, 2^65978166 is an apocalyptic number.

65978166 is an abundant number, since it is smaller than the sum of its proper divisors (68215434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65978166 is a wasteful number, since it uses less digits than its factorization.

65978166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186443.

The product of its digits is 544320, while the sum is 48.

The square root of 65978166 is about 8122.6945036730. The cubic root of 65978166 is about 404.0794332913.

The spelling of 65978166 in words is "sixty-five million, nine hundred seventy-eight thousand, one hundred sixty-six".