66746684784 has 160 divisors (see below), whose sum is σ = 192087705600. Its totient is φ = 19832970240.

The previous prime is 66746684777. The next prime is 66746684791. The reversal of 66746684784 is 48748664766.

66746684784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66746684777) and next prime (66746684791).

It is a congruent number.

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, 9842707 + ... + 9849485.

It is an arithmetic number, because the mean of its divisors is an integer number (1200548160).

Almost surely, 2^66746684784 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 66746684784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96043852800).

66746684784 is an abundant number, since it is smaller than the sum of its proper divisors (125341020816).

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

66746684784 is a wasteful number, since it uses less digits than its factorization.

66746684784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7343 (or 7337 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 66.

The spelling of 66746684784 in words is "sixty-six billion, seven hundred forty-six million, six hundred eighty-four thousand, seven hundred eighty-four".