65981907 has 6 divisors (see below), whose sum is σ = 95307212. Its totient is φ = 43987932.

The previous prime is 65981899. The next prime is 65981953. The reversal of 65981907 is 70918956.

It is not a de Polignac number, because 65981907 - 2³ = 65981899 is a prime.

It is a super-2 number, since 2×65981907² = 8707224102713298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65981957) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3665653 + ... + 3665670.

Almost surely, 2^65981907 is an apocalyptic number.

65981907 is a deficient number, since it is larger than the sum of its proper divisors (29325305).

65981907 is a wasteful number, since it uses less digits than its factorization.

65981907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7331329 (or 7331326 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 65981907 is about 8122.9247811364. The cubic root of 65981907 is about 404.0870703258.

The spelling of 65981907 in words is "sixty-five million, nine hundred eighty-one thousand, nine hundred seven".