66972788485 has 16 divisors (see below), whose sum is σ = 80882985456. Its totient is φ = 53234864128.

The previous prime is 66972788479. The next prime is 66972788501. The reversal of 66972788485 is 58488727966.

It can be written as a sum of positive squares in 8 ways, for example, as 3846728484 + 63126060001 = 62022^2 + 251249^2 .

It is a cyclic number.

It is not a de Polignac number, because 66972788485 - 2⁵ = 66972788453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1392357 + ... + 1439653.

It is an arithmetic number, because the mean of its divisors is an integer number (5055186591).

Almost surely, 2^66972788485 is an apocalyptic number.

It is an amenable number.

66972788485 is a deficient number, since it is larger than the sum of its proper divisors (13910196971).

66972788485 is a wasteful number, since it uses less digits than its factorization.

66972788485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49112.

The product of its digits is 325140480, while the sum is 70.

The spelling of 66972788485 in words is "sixty-six billion, nine hundred seventy-two million, seven hundred eighty-eight thousand, four hundred eighty-five".