66909629 has 4 divisors (see below), whose sum is σ = 67156800. Its totient is φ = 66662460.

The previous prime is 66909613. The next prime is 66909649. The reversal of 66909629 is 92690966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66909629 - 2⁴ = 66909613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66909649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123179 + ... + 123720.

It is an arithmetic number, because the mean of its divisors is an integer number (16789200).

Almost surely, 2^66909629 is an apocalyptic number.

It is an amenable number.

66909629 is a deficient number, since it is larger than the sum of its proper divisors (247171).

66909629 is a wasteful number, since it uses less digits than its factorization.

66909629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247170.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 66909629 is about 8179.8306217183. The cubic root of 66909629 is about 405.9721178487.

The spelling of 66909629 in words is "sixty-six million, nine hundred nine thousand, six hundred twenty-nine".