66205845 has 48 divisors (see below), whose sum is σ = 122383872. Its totient is φ = 33031680.

The previous prime is 66205831. The next prime is 66205859. The reversal of 66205845 is 54850266.

It is an interprime number because it is at equal distance from previous prime (66205831) and next prime (66205859).

It is not a de Polignac number, because 66205845 - 2⁴ = 66205829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47965 + ... + 49325.

It is an arithmetic number, because the mean of its divisors is an integer number (2549664).

Almost surely, 2^66205845 is an apocalyptic number.

It is an amenable number.

66205845 is a deficient number, since it is larger than the sum of its proper divisors (56178027).

66205845 is a wasteful number, since it uses less digits than its factorization.

66205845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 66205845 is about 8136.6974258602. The cubic root of 66205845 is about 404.5437019202.

The spelling of 66205845 in words is "sixty-six million, two hundred five thousand, eight hundred forty-five".