66819622760 has 128 divisors (see below), whose sum is σ = 165097699200. Its totient is φ = 24137794560.

The previous prime is 66819622721. The next prime is 66819622781. The reversal of 66819622760 is 6722691866.

66819622760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54016862 + ... + 54018098.

It is an arithmetic number, because the mean of its divisors is an integer number (1289825775).

Almost surely, 2^66819622760 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 66819622760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82548849600).

66819622760 is an abundant number, since it is smaller than the sum of its proper divisors (98278076440).

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

66819622760 is a wasteful number, since it uses less digits than its factorization.

66819622760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 66819622760 in words is "sixty-six billion, eight hundred nineteen million, six hundred twenty-two thousand, seven hundred sixty".