66629623 has 2 divisors, whose sum is σ = 66629624. Its totient is φ = 66629622.

The previous prime is 66629621. The next prime is 66629653. The reversal of 66629623 is 32692666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66629623 - 2¹ = 66629621 is a prime.

It is a super-2 number, since 2×66629623² = 8879013322244258, which contains 22 as substring.

Together with 66629621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66629621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33314811 + 33314812.

It is an arithmetic number, because the mean of its divisors is an integer number (33314812).

Almost surely, 2^66629623 is an apocalyptic number.

66629623 is a deficient number, since it is larger than the sum of its proper divisors (1).

66629623 is an equidigital number, since it uses as much as digits as its factorization.

66629623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 66629623 is about 8162.6970420321. The cubic root of 66629623 is about 405.4050167692.

The spelling of 66629623 in words is "sixty-six million, six hundred twenty-nine thousand, six hundred twenty-three".