66502260640 has 48 divisors (see below), whose sum is σ = 159774521760. Its totient is φ = 26150037760.

The previous prime is 66502260623. The next prime is 66502260641. The reversal of 66502260640 is 4606220566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66502260640.

It is not an unprimeable number, because it can be changed into a prime (66502260641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3512926 + ... + 3531805.

It is an arithmetic number, because the mean of its divisors is an integer number (3328635870).

Almost surely, 2^66502260640 is an apocalyptic number.

It is an amenable number.

66502260640 is an abundant number, since it is smaller than the sum of its proper divisors (93272261120).

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

66502260640 is a wasteful number, since it uses less digits than its factorization.

66502260640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044805 (or 7044797 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 66502260640 in words is "sixty-six billion, five hundred two million, two hundred sixty thousand, six hundred forty".