66917954977930 has 24 divisors (see below), whose sum is σ = 140118003689508. Its totient is φ = 22943298849408.

The previous prime is 66917954977873. The next prime is 66917954977963. The reversal of 66917954977930 is 3977945971966.

66917954977930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 66913725166561 + 4229811369 = 8180081^2 + 65037^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68283627039 + ... + 68283628018.

Almost surely, 2^{66917954977930} is an apocalyptic number.

66917954977930 is an abundant number, since it is smaller than the sum of its proper divisors (73200048711578).

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

66917954977930 is a wasteful number, since it uses less digits than its factorization.

66917954977930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136567255078 (or 136567255071 counting only the distinct ones).

The product of its (nonzero) digits is 4860913680, while the sum is 82.

The spelling of 66917954977930 in words is "sixty-six trillion, nine hundred seventeen billion, nine hundred fifty-four million, nine hundred seventy-seven thousand, nine hundred thirty".