66040888604820 has 24 divisors (see below), whose sum is σ = 184914488093664. Its totient is φ = 17610903627936.

The previous prime is 66040888604777. The next prime is 66040888604843. The reversal of 66040888604820 is 2840688804066.

It is a super-2 number, since 2×66040888604820² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 1100681476747 = 66040888604820 / (6 + 6 + 0 + 4 + 0 + 8 + 8 + 8 + 6 + 0 + 4 + 8 + 2 + 0).

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, 550340738314 + ... + 550340738433.

It is an arithmetic number, because the mean of its divisors is an integer number (7704770337236).

Almost surely, 2^{66040888604820} is an apocalyptic number.

66040888604820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66040888604820 is an abundant number, since it is smaller than the sum of its proper divisors (118873599488844).

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

66040888604820 is a wasteful number, since it uses less digits than its factorization.

66040888604820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100681476759 (or 1100681476757 counting only the distinct ones).

The product of its (nonzero) digits is 28311552, while the sum is 60.

The spelling of 66040888604820 in words is "sixty-six trillion, forty billion, eight hundred eighty-eight million, six hundred four thousand, eight hundred twenty".