66693043872 has 720 divisors, whose sum is σ = 253837850112. Its totient is φ = 17008911360.

The previous prime is 66693043861. The next prime is 66693043889. The reversal of 66693043872 is 27834039666.

66693043872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 51183573 + ... + 51184875.

Almost surely, 2^66693043872 is an apocalyptic number.

66693043872 is a gapful number since it is divisible by the number (62) 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 66693043872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126918925056).

66693043872 is an abundant number, since it is smaller than the sum of its proper divisors (187144806240).

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

66693043872 is a wasteful number, since it uses less digits than its factorization.

66693043872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383 (or 1359 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 66693043872 in words is "sixty-six billion, six hundred ninety-three million, forty-three thousand, eight hundred seventy-two".