66536640360366 has 128 divisors (see below), whose sum is σ = 155902743553536. Its totient is φ = 18706912481280.

The previous prime is 66536640360319. The next prime is 66536640360397. The reversal of 66536640360366 is 66306304663566.

It is a happy number.

66536640360366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 41776876 + ... + 43340288.

It is an arithmetic number, because the mean of its divisors is an integer number (1217990184012).

Almost surely, 2^{66536640360366} is an apocalyptic number.

66536640360366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66536640360366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77951371776768).

66536640360366 is an abundant number, since it is smaller than the sum of its proper divisors (89366103193170).

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

66536640360366 is a wasteful number, since it uses less digits than its factorization.

66536640360366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563986.

The product of its (nonzero) digits is 151165440, while the sum is 60.

The spelling of 66536640360366 in words is "sixty-six trillion, five hundred thirty-six billion, six hundred forty million, three hundred sixty thousand, three hundred sixty-six".