66572747 has 6 divisors (see below), whose sum is σ = 67432428. Its totient is φ = 65723892.

The previous prime is 66572743. The next prime is 66572767. The reversal of 66572747 is 74727566.

It is not a de Polignac number, because 66572747 - 2² = 66572743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66572698 and 66572707.

It is not an unprimeable number, because it can be changed into a prime (66572743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 908 + ... + 11574.

It is an arithmetic number, because the mean of its divisors is an integer number (11238738).

Almost surely, 2^66572747 is an apocalyptic number.

66572747 is a deficient number, since it is larger than the sum of its proper divisors (859681).

66572747 is an equidigital number, since it uses as much as digits as its factorization.

66572747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10825 (or 10746 counting only the distinct ones).

The product of its digits is 493920, while the sum is 44.

The square root of 66572747 is about 8159.2124007161. The cubic root of 66572747 is about 405.2896307560.

The spelling of 66572747 in words is "sixty-six million, five hundred seventy-two thousand, seven hundred forty-seven".