65681634 has 16 divisors (see below), whose sum is σ = 131495040. Its totient is φ = 21871920.

The previous prime is 65681617. The next prime is 65681639. The reversal of 65681634 is 43618656.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65681592 and 65681601.

It is not an unprimeable number, because it can be changed into a prime (65681639) 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, 1719 + ... + 11589.

It is an arithmetic number, because the mean of its divisors is an integer number (8218440).

Almost surely, 2^65681634 is an apocalyptic number.

65681634 is an abundant number, since it is smaller than the sum of its proper divisors (65813406).

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

65681634 is a wasteful number, since it uses less digits than its factorization.

65681634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985.

The product of its digits is 103680, while the sum is 39.

The square root of 65681634 is about 8104.4206455489. The cubic root of 65681634 is about 403.4731597857.

The spelling of 65681634 in words is "sixty-five million, six hundred eighty-one thousand, six hundred thirty-four".