65978361 has 8 divisors (see below), whose sum is σ = 97745760. Its totient is φ = 43985556.

The previous prime is 65978357. The next prime is 65978369. The reversal of 65978361 is 16387956.

It is a happy number.

It is not a de Polignac number, because 65978361 - 2² = 65978357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65978369) 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, 1221795 + ... + 1221848.

It is an arithmetic number, because the mean of its divisors is an integer number (12218220).

Almost surely, 2^65978361 is an apocalyptic number.

It is an amenable number.

65978361 is a deficient number, since it is larger than the sum of its proper divisors (31767399).

65978361 is a wasteful number, since it uses less digits than its factorization.

65978361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443652 (or 2443646 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 65978361 is about 8122.7065070702. The cubic root of 65978361 is about 404.0798313796.

The spelling of 65978361 in words is "sixty-five million, nine hundred seventy-eight thousand, three hundred sixty-one".