66747477888 has 1536 divisors, whose sum is σ = 273737318400. Its totient is φ = 15109079040.

The previous prime is 66747477877. The next prime is 66747477899. The reversal of 66747477888 is 88877474766.

66747477888 is a `hidden beast` number, since 6 + 6 + 7 + 474 + 7 + 78 + 88 = 666.

It is an interprime number because it is at equal distance from previous prime (66747477877) and next prime (66747477899).

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1420159081 + ... + 1420159127.

It is an arithmetic number, because the mean of its divisors is an integer number (178214400).

Almost surely, 2^66747477888 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 66747477888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136868659200).

66747477888 is an abundant number, since it is smaller than the sum of its proper divisors (206989840512).

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

66747477888 is a wasteful number, since it uses less digits than its factorization.

66747477888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 145 counting only the distinct ones).

The product of its digits is 708083712, while the sum is 72.

The spelling of 66747477888 in words is "sixty-six billion, seven hundred forty-seven million, four hundred seventy-seven thousand, eight hundred eighty-eight".