65766638 has 32 divisors (see below), whose sum is σ = 119159040. Its totient is φ = 26593920.

The previous prime is 65766611. The next prime is 65766671. The reversal of 65766638 is 83666756.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65766592 and 65766601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114893 + ... + 115463.

It is an arithmetic number, because the mean of its divisors is an integer number (3723720).

Almost surely, 2^65766638 is an apocalyptic number.

65766638 is a deficient number, since it is larger than the sum of its proper divisors (53392402).

65766638 is a wasteful number, since it uses less digits than its factorization.

65766638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its digits is 1088640, while the sum is 47.

The square root of 65766638 is about 8109.6632482490. The cubic root of 65766638 is about 403.6471406769.

The spelling of 65766638 in words is "sixty-five million, seven hundred sixty-six thousand, six hundred thirty-eight".