66081495424 has 128 divisors (see below), whose sum is σ = 156459758400. Its totient is φ = 27200323584.

The previous prime is 66081495421. The next prime is 66081495427. The reversal of 66081495424 is 42459418066.

It is an interprime number because it is at equal distance from previous prime (66081495421) and next prime (66081495427).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66081495421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5008324 + ... + 5021500.

Almost surely, 2^66081495424 is an apocalyptic number.

66081495424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66081495424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78229879200).

66081495424 is an abundant number, since it is smaller than the sum of its proper divisors (90378262976).

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

66081495424 is a wasteful number, since it uses less digits than its factorization.

66081495424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13420 (or 13408 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 66081495424 in words is "sixty-six billion, eighty-one million, four hundred ninety-five thousand, four hundred twenty-four".