66291730 has 8 divisors (see below), whose sum is σ = 119325132. Its totient is φ = 26516688.

The previous prime is 66291713. The next prime is 66291737. The reversal of 66291730 is 3719266.

It can be written as a sum of positive squares in 2 ways, for example, as 63792169 + 2499561 = 7987^2 + 1581^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66291737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3314577 + ... + 3314596.

Almost surely, 2^66291730 is an apocalyptic number.

66291730 is a deficient number, since it is larger than the sum of its proper divisors (53033402).

66291730 is a wasteful number, since it uses less digits than its factorization.

66291730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629180.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 66291730 is about 8141.9733480281. The cubic root of 66291730 is about 404.7185566870.

The spelling of 66291730 in words is "sixty-six million, two hundred ninety-one thousand, seven hundred thirty".