66388710629 has 8 divisors (see below), whose sum is σ = 68254599072. Its totient is φ = 64537457040.

The previous prime is 66388710581. The next prime is 66388710637. The reversal of 66388710629 is 92601788366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66388710629 - 2⁸ = 66388710373 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 (66388710679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3649514 + ... + 3667659.

It is an arithmetic number, because the mean of its divisors is an integer number (8531824884).

Almost surely, 2^66388710629 is an apocalyptic number.

It is an amenable number.

66388710629 is a deficient number, since it is larger than the sum of its proper divisors (1865888443).

66388710629 is a wasteful number, since it uses less digits than its factorization.

66388710629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7317427.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 66388710629 in words is "sixty-six billion, three hundred eighty-eight million, seven hundred ten thousand, six hundred twenty-nine".