66980357028004 has 60 divisors (see below), whose sum is σ = 136794331316300. Its totient is φ = 28695180939264.

The previous prime is 66980357027933. The next prime is 66980357028103. The reversal of 66980357028004 is 40082075308966.

It can be written as a sum of positive squares in 2 ways, for example, as 2874713468004 + 64105643560000 = 1695498^2 + 8006600^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66980357028004.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24528352 + ... + 27121960.

Almost surely, 2^{66980357028004} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66980357028004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68397165658150).

66980357028004 is an abundant number, since it is smaller than the sum of its proper divisors (69813974288296).

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

66980357028004 is a wasteful number, since it uses less digits than its factorization.

66980357028004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596330 (or 2596307 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 58.

The spelling of 66980357028004 in words is "sixty-six trillion, nine hundred eighty billion, three hundred fifty-seven million, twenty-eight thousand, four".