66863149056 has 624 divisors, whose sum is σ = 226691232768. Its totient is φ = 19508428800.

The previous prime is 66863149037. The next prime is 66863149057. The reversal of 66863149056 is 65094136866.

It is a super-2 number, since 2×66863149056² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 66863148993 and 66863149011.

It is not an unprimeable number, because it can be changed into a prime (66863149057) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 339406750 + ... + 339406946.

It is an arithmetic number, because the mean of its divisors is an integer number (363287232).

Almost surely, 2^66863149056 is an apocalyptic number.

66863149056 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 66863149056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113345616384).

66863149056 is an abundant number, since it is smaller than the sum of its proper divisors (159828083712).

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

66863149056 is a wasteful number, since it uses less digits than its factorization.

66863149056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 66863149056 in words is "sixty-six billion, eight hundred sixty-three million, one hundred forty-nine thousand, fifty-six".