66714681 has 48 divisors (see below), whose sum is σ = 109166400. Its totient is φ = 35988480.

The previous prime is 66714679. The next prime is 66714689. The reversal of 66714681 is 18641766.

It is a happy number.

It is not a de Polignac number, because 66714681 - 2¹ = 66714679 is a prime.

It is a super-2 number, since 2×66714681² = 8901697321863522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66714689) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116965 + ... + 117533.

It is an arithmetic number, because the mean of its divisors is an integer number (2274300).

Almost surely, 2^66714681 is an apocalyptic number.

It is an amenable number.

66714681 is a deficient number, since it is larger than the sum of its proper divisors (42451719).

66714681 is a wasteful number, since it uses less digits than its factorization.

66714681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 619 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 66714681 is about 8167.9055454872. The cubic root of 66714681 is about 405.5774539693.

The spelling of 66714681 in words is "sixty-six million, seven hundred fourteen thousand, six hundred eighty-one".