66745748 has 6 divisors (see below), whose sum is σ = 116805066. Its totient is φ = 33372872.

The previous prime is 66745717. The next prime is 66745753. The reversal of 66745748 is 84754766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 64192144 + 2553604 = 8012^2 + 1598^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8343215 + ... + 8343222.

It is an arithmetic number, because the mean of its divisors is an integer number (19467511).

Almost surely, 2^66745748 is an apocalyptic number.

It is an amenable number.

66745748 is a deficient number, since it is larger than the sum of its proper divisors (50059318).

66745748 is a wasteful number, since it uses less digits than its factorization.

66745748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16686441 (or 16686439 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 47.

The square root of 66745748 is about 8169.8070968659. The cubic root of 66745748 is about 405.6403992324.

The spelling of 66745748 in words is "sixty-six million, seven hundred forty-five thousand, seven hundred forty-eight".