66887847936 has 624 divisors, whose sum is σ = 241193365504. Its totient is φ = 17390370816.

The previous prime is 66887847911. The next prime is 66887847941. The reversal of 66887847936 is 63974878866.

66887847936 is a `hidden beast` number, since 6 + 6 + 88 + 78 + 479 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (624).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 426037170 + ... + 426037326.

Almost surely, 2^66887847936 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 66887847936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120596682752).

66887847936 is an abundant number, since it is smaller than the sum of its proper divisors (174305517568).

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

66887847936 is a wasteful number, since it uses less digits than its factorization.

66887847936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 309 counting only the distinct ones).

The product of its digits is 585252864, while the sum is 72.

The spelling of 66887847936 in words is "sixty-six billion, eight hundred eighty-seven million, eight hundred forty-seven thousand, nine hundred thirty-six".