66945747 has 16 divisors (see below), whose sum is σ = 97637760. Its totient is φ = 40464000.

The previous prime is 66945701. The next prime is 66945751. The reversal of 66945747 is 74754966.

It is not a de Polignac number, because 66945747 - 2⁸ = 66945491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66945696 and 66945705.

It is not an unprimeable number, because it can be changed into a prime (66945757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10704 + ... + 15762.

It is an arithmetic number, because the mean of its divisors is an integer number (6102360).

Almost surely, 2^66945747 is an apocalyptic number.

66945747 is a deficient number, since it is larger than the sum of its proper divisors (30692013).

66945747 is a wasteful number, since it uses less digits than its factorization.

66945747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5474.

The product of its digits is 1270080, while the sum is 48.

The square root of 66945747 is about 8182.0380712876. The cubic root of 66945747 is about 406.0451529938.

The spelling of 66945747 in words is "sixty-six million, nine hundred forty-five thousand, seven hundred forty-seven".