65681694 has 48 divisors (see below), whose sum is σ = 158558400. Its totient is φ = 19510848.

The previous prime is 65681687. The next prime is 65681711. The reversal of 65681694 is 49618656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1947 + ... + 11625.

It is an arithmetic number, because the mean of its divisors is an integer number (3303300).

Almost surely, 2^65681694 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65681694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79279200).

65681694 is an abundant number, since it is smaller than the sum of its proper divisors (92876706).

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

65681694 is a wasteful number, since it uses less digits than its factorization.

65681694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9729 (or 9726 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 65681694 is about 8104.4243472316. The cubic root of 65681694 is about 403.4732826429.

The spelling of 65681694 in words is "sixty-five million, six hundred eighty-one thousand, six hundred ninety-four".