66633739 has 2 divisors, whose sum is σ = 66633740. Its totient is φ = 66633738.

The previous prime is 66633731. The next prime is 66633857. The reversal of 66633739 is 93733666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66633739 - 2³ = 66633731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66633695 and 66633704.

It is not a weakly prime, because it can be changed into another prime (66633731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33316869 + 33316870.

It is an arithmetic number, because the mean of its divisors is an integer number (33316870).

Almost surely, 2^66633739 is an apocalyptic number.

66633739 is a deficient number, since it is larger than the sum of its proper divisors (1).

66633739 is an equidigital number, since it uses as much as digits as its factorization.

66633739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 43.

The square root of 66633739 is about 8162.9491606894. The cubic root of 66633739 is about 405.4133644711.

The spelling of 66633739 in words is "sixty-six million, six hundred thirty-three thousand, seven hundred thirty-nine".