66249766 has 16 divisors (see below), whose sum is σ = 108682560. Its totient is φ = 30037480.

The previous prime is 66249749. The next prime is 66249787. The reversal of 66249766 is 66794266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5625 + ... + 12811.

It is an arithmetic number, because the mean of its divisors is an integer number (6792660).

Almost surely, 2^66249766 is an apocalyptic number.

66249766 is a deficient number, since it is larger than the sum of its proper divisors (42432794).

66249766 is a wasteful number, since it uses less digits than its factorization.

66249766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7619.

The product of its digits is 653184, while the sum is 46.

The square root of 66249766 is about 8139.3959235314. The cubic root of 66249766 is about 404.6331403289.

The spelling of 66249766 in words is "sixty-six million, two hundred forty-nine thousand, seven hundred sixty-six".