66847993344 has 240 divisors, whose sum is σ = 210864901104. Its totient is φ = 20218675200.

The previous prime is 66847993337. The next prime is 66847993367. The reversal of 66847993344 is 44339974866.

66847993344 is a `hidden beast` number, since 66 + 84 + 79 + 93 + 344 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38572702 + ... + 38574434.

Almost surely, 2^66847993344 is an apocalyptic number.

66847993344 is a gapful number since it is divisible by the number (64) 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 66847993344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105432450552).

66847993344 is an abundant number, since it is smaller than the sum of its proper divisors (144016907760).

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

66847993344 is a wasteful number, since it uses less digits than its factorization.

66847993344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529 (or 2510 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 63.

The spelling of 66847993344 in words is "sixty-six billion, eight hundred forty-seven million, nine hundred ninety-three thousand, three hundred forty-four".