66678898176 has 480 divisors, whose sum is σ = 223923667968. Its totient is φ = 18877317120.

The previous prime is 66678898163. The next prime is 66678898183. The reversal of 66678898176 is 67189887666.

66678898176 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66678898176² (a number of 22 digits) contains 22 as substring.

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

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, 192158035 + ... + 192158381.

Almost surely, 2^66678898176 is an apocalyptic number.

66678898176 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 66678898176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111961833984).

66678898176 is an abundant number, since it is smaller than the sum of its proper divisors (157244769792).

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

66678898176 is a wasteful number, since it uses less digits than its factorization.

66678898176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 603 counting only the distinct ones).

The product of its digits is 292626432, while the sum is 72.

The spelling of 66678898176 in words is "sixty-six billion, six hundred seventy-eight million, eight hundred ninety-eight thousand, one hundred seventy-six".