66767979498240 has 576 divisors, whose sum is σ = 221174007183360. Its totient is φ = 17156352245760.

The previous prime is 66767979498229. The next prime is 66767979498247. The reversal of 66767979498240 is 4289497976766.

It is not an unprimeable number, because it can be changed into a prime (66767979498247) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3800320176 + ... + 3800337744.

It is an arithmetic number, because the mean of its divisors is an integer number (383982651360).

Almost surely, 2^{66767979498240} is an apocalyptic number.

66767979498240 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 66767979498240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110587003591680).

66767979498240 is an abundant number, since it is smaller than the sum of its proper divisors (154406027685120).

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

66767979498240 is a wasteful number, since it uses less digits than its factorization.

66767979498240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17980 (or 17966 counting only the distinct ones).

The product of its (nonzero) digits is 13826598912, while the sum is 84.

The spelling of 66767979498240 in words is "sixty-six trillion, seven hundred sixty-seven billion, nine hundred seventy-nine million, four hundred ninety-eight thousand, two hundred forty".