66240040664 has 64 divisors (see below), whose sum is σ = 150909143040. Its totient is φ = 26641929600.

The previous prime is 66240040589. The next prime is 66240040667. The reversal of 66240040664 is 46604004266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66240040667) 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, 416912 + ... + 553439.

It is an arithmetic number, because the mean of its divisors is an integer number (2357955360).

Almost surely, 2^66240040664 is an apocalyptic number.

It is an amenable number.

66240040664 is an abundant number, since it is smaller than the sum of its proper divisors (84669102376).

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

66240040664 is a wasteful number, since it uses less digits than its factorization.

66240040664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970440 (or 970436 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 66240040664 in words is "sixty-six billion, two hundred forty million, forty thousand, six hundred sixty-four".