66977280000 has 1300 divisors, whose sum is σ = 278660768760. Its totient is φ = 15925248000.

The previous prime is 66977279987. The next prime is 66977280011. The reversal of 66977280000 is 8277966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 3525119991 + ... + 3525120009.

Almost surely, 2^66977280000 is an apocalyptic number.

66977280000 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 66977280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139330384380).

66977280000 is an abundant number, since it is smaller than the sum of its proper divisors (211683488760).

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

66977280000 is an equidigital number, since it uses as much as digits as its factorization.

66977280000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 66977280000 in words is "sixty-six billion, nine hundred seventy-seven million, two hundred eighty thousand".