66456629 has 4 divisors (see below), whose sum is σ = 68002176. Its totient is φ = 64911084.

The previous prime is 66456619. The next prime is 66456659. The reversal of 66456629 is 92665466.

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 66456629 - 2²⁰ = 65408053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66456629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66456619) 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, 772709 + ... + 772794.

It is an arithmetic number, because the mean of its divisors is an integer number (17000544).

Almost surely, 2^66456629 is an apocalyptic number.

It is an amenable number.

66456629 is a deficient number, since it is larger than the sum of its proper divisors (1545547).

66456629 is a wasteful number, since it uses less digits than its factorization.

66456629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545546.

The product of its digits is 466560, while the sum is 44.

The square root of 66456629 is about 8152.0935347922. The cubic root of 66456629 is about 405.0538545465.

The spelling of 66456629 in words is "sixty-six million, four hundred fifty-six thousand, six hundred twenty-nine".