66988677120 has 192 divisors, whose sum is σ = 215039784960. Its totient is φ = 17802952704.

The previous prime is 66988677097. The next prime is 66988677187. The reversal of 66988677120 is 2177688966.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×66988677120² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9427489 + ... + 9434591.

It is an arithmetic number, because the mean of its divisors is an integer number (1119998880).

Almost surely, 2^66988677120 is an apocalyptic number.

66988677120 is a gapful number since it is divisible by the number (60) 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 66988677120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107519892480).

66988677120 is an abundant number, since it is smaller than the sum of its proper divisors (148051107840).

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

66988677120 is a wasteful number, since it uses less digits than its factorization.

66988677120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7440 (or 7420 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 66988677120 in words is "sixty-six billion, nine hundred eighty-eight million, six hundred seventy-seven thousand, one hundred twenty".