66662645 has 8 divisors (see below), whose sum is σ = 91423104. Its totient is φ = 45711504.

The previous prime is 66662623. The next prime is 66662647. The reversal of 66662645 is 54626666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66662645 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 (66662647) 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, 952289 + ... + 952358.

It is an arithmetic number, because the mean of its divisors is an integer number (11427888).

Almost surely, 2^66662645 is an apocalyptic number.

It is an amenable number.

66662645 is a deficient number, since it is larger than the sum of its proper divisors (24760459).

66662645 is a wasteful number, since it uses less digits than its factorization.

66662645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904659.

The product of its digits is 311040, while the sum is 41.

The square root of 66662645 is about 8164.7195297818. The cubic root of 66662645 is about 405.4719793446.

The spelling of 66662645 in words is "sixty-six million, six hundred sixty-two thousand, six hundred forty-five".