66654629 has 2 divisors, whose sum is σ = 66654630. Its totient is φ = 66654628.

The previous prime is 66654611. The next prime is 66654661. The reversal of 66654629 is 92645666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 12264004 = 7375^2 + 3502^2 .

It is a cyclic number.

It is not a de Polignac number, because 66654629 - 2⁸ = 66654373 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66654629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66654829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327314 + 33327315.

It is an arithmetic number, because the mean of its divisors is an integer number (33327315).

Almost surely, 2^66654629 is an apocalyptic number.

It is an amenable number.

66654629 is a deficient number, since it is larger than the sum of its proper divisors (1).

66654629 is an equidigital number, since it uses as much as digits as its factorization.

66654629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 66654629 is about 8164.2286224725. The cubic root of 66654629 is about 405.4557263958.

The spelling of 66654629 in words is "sixty-six million, six hundred fifty-four thousand, six hundred twenty-nine".