66041255794816 has 64 divisors (see below), whose sum is σ = 132254759400480. Its totient is φ = 32847921266688.

The previous prime is 66041255794783. The next prime is 66041255794837. The reversal of 66041255794816 is 61849755214066.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×66041255794816² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621178335 + ... + 621284641.

Almost surely, 2^{66041255794816} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66041255794816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66127379700240).

66041255794816 is an abundant number, since it is smaller than the sum of its proper divisors (66213503605664).

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

66041255794816 is a wasteful number, since it uses less digits than its factorization.

66041255794816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131661 (or 131649 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 64.

The spelling of 66041255794816 in words is "sixty-six trillion, forty-one billion, two hundred fifty-five million, seven hundred ninety-four thousand, eight hundred sixteen".