66622590720 has 864 divisors, whose sum is σ = 280916633088. Its totient is φ = 14798536704.

The previous prime is 66622590649. The next prime is 66622590731. The reversal of 66622590720 is 2709522666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 80558947 + ... + 80559773.

It is an arithmetic number, because the mean of its divisors is an integer number (325134992).

Almost surely, 2^66622590720 is an apocalyptic number.

66622590720 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 66622590720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140458316544).

66622590720 is an abundant number, since it is smaller than the sum of its proper divisors (214294042368).

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

66622590720 is an equidigital number, since it uses as much as digits as its factorization.

66622590720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 66622590720 in words is "sixty-six billion, six hundred twenty-two million, five hundred ninety thousand, seven hundred twenty".