66629791 has 8 divisors (see below), whose sum is σ = 69260400. Its totient is φ = 64021440.

The previous prime is 66629767. The next prime is 66629831. The reversal of 66629791 is 19792666.

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 66629791 - 2¹⁵ = 66597023 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 (66629741) 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, 675 + ... + 11563.

It is an arithmetic number, because the mean of its divisors is an integer number (8657550).

Almost surely, 2^66629791 is an apocalyptic number.

66629791 is a deficient number, since it is larger than the sum of its proper divisors (2630609).

66629791 is a wasteful number, since it uses less digits than its factorization.

66629791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11129.

The product of its digits is 244944, while the sum is 46.

The square root of 66629791 is about 8162.7073327420. The cubic root of 66629791 is about 405.4053574984.

The spelling of 66629791 in words is "sixty-six million, six hundred twenty-nine thousand, seven hundred ninety-one".