66247345 has 8 divisors (see below), whose sum is σ = 79540776. Its totient is φ = 52968576.

The previous prime is 66247343. The next prime is 66247381. The reversal of 66247345 is 54374266.

It can be written as a sum of positive squares in 4 ways, for example, as 12723489 + 53523856 = 3567^2 + 7316^2 .

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 66247345 - 2¹ = 66247343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66247343) 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, 14229 + ... + 18301.

It is an arithmetic number, because the mean of its divisors is an integer number (9942597).

Almost surely, 2^66247345 is an apocalyptic number.

It is an amenable number.

66247345 is a deficient number, since it is larger than the sum of its proper divisors (13293431).

66247345 is a wasteful number, since it uses less digits than its factorization.

66247345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7331.

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

The square root of 66247345 is about 8139.2472010623. The cubic root of 66247345 is about 404.6282113618.

The spelling of 66247345 in words is "sixty-six million, two hundred forty-seven thousand, three hundred forty-five".