66633650 has 12 divisors (see below), whose sum is σ = 123938682. Its totient is φ = 26653440.

The previous prime is 66633647. The next prime is 66633653. The reversal of 66633650 is 5633666.

It is an interprime number because it is at equal distance from previous prime (66633647) and next prime (66633653).

It can be written as a sum of positive squares in 3 ways, for example, as 33651601 + 32982049 = 5801^2 + 5743^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66633650.

It is not an unprimeable number, because it can be changed into a prime (66633653) 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, 666287 + ... + 666386.

Almost surely, 2^66633650 is an apocalyptic number.

66633650 is a deficient number, since it is larger than the sum of its proper divisors (57305032).

66633650 is a wasteful number, since it uses less digits than its factorization.

66633650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332685 (or 1332680 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 35.

The square root of 66633650 is about 8162.9437092265. The cubic root of 66633650 is about 405.4131839729.

The spelling of 66633650 in words is "sixty-six million, six hundred thirty-three thousand, six hundred fifty".