66731650 has 12 divisors (see below), whose sum is σ = 124120962. Its totient is φ = 26692640.

The previous prime is 66731633. The next prime is 66731659. The reversal of 66731650 is 5613766.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 29019769 + 37711881 = 5387^2 + 6141^2 .

It is a super-2 number, since 2×66731650² = 8906226223445000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66731659) 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, 667267 + ... + 667366.

Almost surely, 2^66731650 is an apocalyptic number.

66731650 is a deficient number, since it is larger than the sum of its proper divisors (57389312).

66731650 is a wasteful number, since it uses less digits than its factorization.

66731650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334645 (or 1334640 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66731650 is about 8168.9442402308. The cubic root of 66731650 is about 405.6118375077.

The spelling of 66731650 in words is "sixty-six million, seven hundred thirty-one thousand, six hundred fifty".