66243745 has 8 divisors (see below), whose sum is σ = 82056960. Its totient is φ = 51285360.

The previous prime is 66243739. The next prime is 66243763. The reversal of 66243745 is 54734266.

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

It is not a de Polignac number, because 66243745 - 2¹⁹ = 65719457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213535 + ... + 213844.

It is an arithmetic number, because the mean of its divisors is an integer number (10257120).

Almost surely, 2^66243745 is an apocalyptic number.

It is an amenable number.

66243745 is a deficient number, since it is larger than the sum of its proper divisors (15813215).

66243745 is a wasteful number, since it uses less digits than its factorization.

66243745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427415.

The product of its digits is 120960, while the sum is 37.

The square root of 66243745 is about 8139.0260473843. The cubic root of 66243745 is about 404.6208818205.

The spelling of 66243745 in words is "sixty-six million, two hundred forty-three thousand, seven hundred forty-five".