65640859 has 6 divisors (see below), whose sum is σ = 69729524. Its totient is φ = 61779360.

The previous prime is 65640851. The next prime is 65640881. The reversal of 65640859 is 95804656.

It is not a de Polignac number, because 65640859 - 2³ = 65640851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65640851) 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, 113277 + ... + 113854.

Almost surely, 2^65640859 is an apocalyptic number.

65640859 is a deficient number, since it is larger than the sum of its proper divisors (4088665).

65640859 is a wasteful number, since it uses less digits than its factorization.

65640859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227165 (or 227148 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 65640859 is about 8101.9046526110. The cubic root of 65640859 is about 403.3896507811.

The spelling of 65640859 in words is "sixty-five million, six hundred forty thousand, eight hundred fifty-nine".