66784258830 has 64 divisors (see below), whose sum is σ = 166292932608. Its totient is φ = 17147114880.

The previous prime is 66784258817. The next prime is 66784258831. The reversal of 66784258830 is 3885248766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66784258831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 949 + ... + 365471.

It is an arithmetic number, because the mean of its divisors is an integer number (2598327072).

Almost surely, 2^66784258830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66784258830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83146466304).

66784258830 is an abundant number, since it is smaller than the sum of its proper divisors (99508673778).

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

66784258830 is a wasteful number, since it uses less digits than its factorization.

66784258830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364761.

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 66784258830 in words is "sixty-six billion, seven hundred eighty-four million, two hundred fifty-eight thousand, eight hundred thirty".