66977942255104 has 80 divisors (see below), whose sum is σ = 136117711279440. Its totient is φ = 32915453829120.

The previous prime is 66977942255093. The next prime is 66977942255197. The reversal of 66977942255104 is 40155224977966.

It is a self number, because there is not a number n which added to its sum of digits gives 66977942255104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170569714 + ... + 170961934.

It is an arithmetic number, because the mean of its divisors is an integer number (1701471390993).

Almost surely, 2^{66977942255104} is an apocalyptic number.

66977942255104 is a gapful number since it is divisible by the number (64) 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 66977942255104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68058855639720).

66977942255104 is an abundant number, since it is smaller than the sum of its proper divisors (69139769024336).

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

66977942255104 is an equidigital number, since it uses as much as digits as its factorization.

66977942255104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397951 (or 397935 counting only the distinct ones).

The product of its (nonzero) digits is 228614400, while the sum is 67.

The spelling of 66977942255104 in words is "sixty-six trillion, nine hundred seventy-seven billion, nine hundred forty-two million, two hundred fifty-five thousand, one hundred four".