66619069440 has 1408 divisors, whose sum is σ = 289768734720. Its totient is φ = 12651724800.

The previous prime is 66619069427. The next prime is 66619069493. The reversal of 66619069440 is 4496091666.

It is a tau number, because it is divible by the number of its divisors (1408).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 843279321 + ... + 843279399.

Almost surely, 2^66619069440 is an apocalyptic number.

66619069440 is a gapful number since it is divisible by the number (60) 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 66619069440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144884367360).

66619069440 is an abundant number, since it is smaller than the sum of its proper divisors (223149665280).

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

66619069440 is a wasteful number, since it uses less digits than its factorization.

66619069440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 66619069440 in words is "sixty-six billion, six hundred nineteen million, sixty-nine thousand, four hundred forty".