66240745 has 8 divisors (see below), whose sum is σ = 83672640. Its totient is φ = 50203440.

The previous prime is 66240739. The next prime is 66240761. The reversal of 66240745 is 54704266.

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

It is not a de Polignac number, because 66240745 - 2³ = 66240737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66240745.

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, 348541 + ... + 348730.

It is an arithmetic number, because the mean of its divisors is an integer number (10459080).

Almost surely, 2^66240745 is an apocalyptic number.

It is an amenable number.

66240745 is a deficient number, since it is larger than the sum of its proper divisors (17431895).

66240745 is a wasteful number, since it uses less digits than its factorization.

66240745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697295.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 66240745 is about 8138.8417480622. The cubic root of 66240745 is about 404.6147736666.

The spelling of 66240745 in words is "sixty-six million, two hundred forty thousand, seven hundred forty-five".