65681379 has 6 divisors (see below), whose sum is σ = 94873116. Its totient is φ = 43787580.

The previous prime is 65681359. The next prime is 65681381. The reversal of 65681379 is 97318656.

It is a happy number.

65681379 is a `hidden beast` number, since 6 + 568 + 13 + 79 = 666.

It is not a de Polignac number, because 65681379 - 2¹⁶ = 65615843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65681359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3648957 + ... + 3648974.

It is an arithmetic number, because the mean of its divisors is an integer number (15812186).

Almost surely, 2^65681379 is an apocalyptic number.

65681379 is a deficient number, since it is larger than the sum of its proper divisors (29191737).

65681379 is a wasteful number, since it uses less digits than its factorization.

65681379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7297937 (or 7297934 counting only the distinct ones).

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

The square root of 65681379 is about 8104.4049133789. The cubic root of 65681379 is about 403.4726376419.

The spelling of 65681379 in words is "sixty-five million, six hundred eighty-one thousand, three hundred seventy-nine".