66980768016579 has 32 divisors (see below), whose sum is σ = 91792726794240. Its totient is φ = 43423536004992.

The previous prime is 66980768016553. The next prime is 66980768016583. The reversal of 66980768016579 is 97561086708966.

It is not a de Polignac number, because 66980768016579 - 2¹³ = 66980768008387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66980768016529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 676435077 + ... + 676534089.

It is an arithmetic number, because the mean of its divisors is an integer number (2868522712320).

Almost surely, 2^{66980768016579} is an apocalyptic number.

66980768016579 is a deficient number, since it is larger than the sum of its proper divisors (24811958777661).

66980768016579 is a wasteful number, since it uses less digits than its factorization.

66980768016579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129779.

The product of its (nonzero) digits is 1646023680, while the sum is 78.

The spelling of 66980768016579 in words is "sixty-six trillion, nine hundred eighty billion, seven hundred sixty-eight million, sixteen thousand, five hundred seventy-nine".