66645641 has 8 divisors (see below), whose sum is σ = 67896000. Its totient is φ = 65404080.

The previous prime is 66645619. The next prime is 66645653. The reversal of 66645641 is 14654666.

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-66645641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66645595 and 66645604.

It is not an unprimeable number, because it can be changed into a prime (66645041) 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, 14210 + ... + 18308.

It is an arithmetic number, because the mean of its divisors is an integer number (8487000).

Almost surely, 2^66645641 is an apocalyptic number.

It is an amenable number.

66645641 is a deficient number, since it is larger than the sum of its proper divisors (1250359).

66645641 is a wasteful number, since it uses less digits than its factorization.

66645641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4399.

The product of its digits is 103680, while the sum is 38.

The square root of 66645641 is about 8163.6781538716. The cubic root of 66645641 is about 405.4375011055.

The spelling of 66645641 in words is "sixty-six million, six hundred forty-five thousand, six hundred forty-one".