66254660 has 12 divisors (see below), whose sum is σ = 139134828. Its totient is φ = 26501856.

The previous prime is 66254659. The next prime is 66254663. The reversal of 66254660 is 6645266.

It can be written as a sum of positive squares in 2 ways, for example, as 20232004 + 46022656 = 4498^2 + 6784^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66254660.

It is not an unprimeable number, because it can be changed into a prime (66254663) 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, 1656347 + ... + 1656386.

It is an arithmetic number, because the mean of its divisors is an integer number (11594569).

Almost surely, 2^66254660 is an apocalyptic number.

It is an amenable number.

66254660 is an abundant number, since it is smaller than the sum of its proper divisors (72880168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66254660 is a wasteful number, since it uses less digits than its factorization.

66254660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312742 (or 3312740 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 66254660 is about 8139.6965545406. The cubic root of 66254660 is about 404.6431037645.

The spelling of 66254660 in words is "sixty-six million, two hundred fifty-four thousand, six hundred sixty".