66212651667 has 16 divisors (see below), whose sum is σ = 88399503360. Its totient is φ = 44083824000.

The previous prime is 66212651639. The next prime is 66212651677. The reversal of 66212651667 is 76615621266.

It is not a de Polignac number, because 66212651667 - 2¹⁰ = 66212650643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66212651627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12099742 + ... + 12105212.

It is an arithmetic number, because the mean of its divisors is an integer number (5524968960).

Almost surely, 2^66212651667 is an apocalyptic number.

66212651667 is a deficient number, since it is larger than the sum of its proper divisors (22186851693).

66212651667 is a wasteful number, since it uses less digits than its factorization.

66212651667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10034.

The product of its digits is 1088640, while the sum is 48.

The spelling of 66212651667 in words is "sixty-six billion, two hundred twelve million, six hundred fifty-one thousand, six hundred sixty-seven".