65665650 has 24 divisors (see below), whose sum is σ = 162851184. Its totient is φ = 17510800.

The previous prime is 65665637. The next prime is 65665661. The reversal of 65665650 is 5656656.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 65665599 and 65665608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218736 + ... + 219035.

It is an arithmetic number, because the mean of its divisors is an integer number (6785466).

Almost surely, 2^65665650 is an apocalyptic number.

65665650 is an abundant number, since it is smaller than the sum of its proper divisors (97185534).

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

65665650 is a wasteful number, since it uses less digits than its factorization.

65665650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437786 (or 437781 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 65665650 is about 8103.4344570682. The cubic root of 65665650 is about 403.4404279661.

The spelling of 65665650 in words is "sixty-five million, six hundred sixty-five thousand, six hundred fifty".