66983747 has 4 divisors (see below), whose sum is σ = 67014240. Its totient is φ = 66953256.

The previous prime is 66983731. The next prime is 66983753. The reversal of 66983747 is 74738966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66983747 - 2⁴ = 66983731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66983695 and 66983704.

It is not an unprimeable number, because it can be changed into a prime (66983717) 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, 11672 + ... + 16437.

It is an arithmetic number, because the mean of its divisors is an integer number (16753560).

Almost surely, 2^66983747 is an apocalyptic number.

66983747 is a deficient number, since it is larger than the sum of its proper divisors (30493).

66983747 is a wasteful number, since it uses less digits than its factorization.

66983747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30492.

The product of its digits is 1524096, while the sum is 50.

The square root of 66983747 is about 8184.3599016661. The cubic root of 66983747 is about 406.1219654278.

The spelling of 66983747 in words is "sixty-six million, nine hundred eighty-three thousand, seven hundred forty-seven".