66854836356 has 96 divisors (see below), whose sum is σ = 194657154048. Its totient is φ = 17349682560.

The previous prime is 66854836333. The next prime is 66854836387. The reversal of 66854836356 is 65363845866.

It is a happy number.

66854836356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66854836356.

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, 1043506 + ... + 1105718.

It is an arithmetic number, because the mean of its divisors is an integer number (2027678688).

Almost surely, 2^66854836356 is an apocalyptic number.

66854836356 is a gapful number since it is divisible by the number (66) 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 66854836356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97328577024).

66854836356 is an abundant number, since it is smaller than the sum of its proper divisors (127802317692).

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

66854836356 is a wasteful number, since it uses less digits than its factorization.

66854836356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63401 (or 63399 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 60.

The spelling of 66854836356 in words is "sixty-six billion, eight hundred fifty-four million, eight hundred thirty-six thousand, three hundred fifty-six".