65681023 has 4 divisors (see below), whose sum is σ = 65892528. Its totient is φ = 65469520.

The previous prime is 65681017. The next prime is 65681039. The reversal of 65681023 is 32018656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65681023 - 2⁵ = 65680991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65681003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105286 + ... + 105907.

It is an arithmetic number, because the mean of its divisors is an integer number (16473132).

Almost surely, 2^65681023 is an apocalyptic number.

65681023 is a deficient number, since it is larger than the sum of its proper divisors (211505).

65681023 is a wasteful number, since it uses less digits than its factorization.

65681023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211504.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 65681023 is about 8104.3829499845. The cubic root of 65681023 is about 403.4719086858.

Adding to 65681023 its reverse (32018656), we get a palindrome (97699679).

The spelling of 65681023 in words is "sixty-five million, six hundred eighty-one thousand, twenty-three".