66453813220 has 12 divisors (see below), whose sum is σ = 139553007804. Its totient is φ = 26581525280.

The previous prime is 66453813169. The next prime is 66453813269. The reversal of 66453813220 is 2231835466.

It can be written as a sum of positive squares in 2 ways, for example, as 48262817344 + 18190995876 = 219688^2 + 134874^2 .

It is a super-2 number, since 2×66453813220² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661345311 + ... + 1661345350.

It is an arithmetic number, because the mean of its divisors is an integer number (11629417317).

Almost surely, 2^66453813220 is an apocalyptic number.

It is an amenable number.

66453813220 is an abundant number, since it is smaller than the sum of its proper divisors (73099194584).

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

66453813220 is a wasteful number, since it uses less digits than its factorization.

66453813220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322690670 (or 3322690668 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 66453813220 in words is "sixty-six billion, four hundred fifty-three million, eight hundred thirteen thousand, two hundred twenty".