66745669 has 8 divisors (see below), whose sum is σ = 68832288. Its totient is φ = 64674000.

The previous prime is 66745667. The next prime is 66745681. The reversal of 66745669 is 96654766.

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 66745669 - 2¹ = 66745667 is a prime.

It is a super-2 number, since 2×66745669² = 8909968660515122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66745667) 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, 5694 + ... + 12880.

It is an arithmetic number, because the mean of its divisors is an integer number (8604036).

Almost surely, 2^66745669 is an apocalyptic number.

It is an amenable number.

66745669 is a deficient number, since it is larger than the sum of its proper divisors (2086619).

66745669 is a wasteful number, since it uses less digits than its factorization.

66745669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7475.

The product of its digits is 1632960, while the sum is 49.

The square root of 66745669 is about 8169.8022619890. The cubic root of 66745669 is about 405.6402391942.

The spelling of 66745669 in words is "sixty-six million, seven hundred forty-five thousand, six hundred sixty-nine".