66212651670 has 64 divisors (see below), whose sum is σ = 173475095040. Its totient is φ = 16040595200.

The previous prime is 66212651639. The next prime is 66212651677. The reversal of 66212651670 is 7615621266.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66212651677) 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 31 ways as a sum of consecutive naturals, for example, 420991 + ... + 556469.

It is an arithmetic number, because the mean of its divisors is an integer number (2710548360).

Almost surely, 2^66212651670 is an apocalyptic number.

66212651670 is an abundant number, since it is smaller than the sum of its proper divisors (107262443370).

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

66212651670 is a wasteful number, since it uses less digits than its factorization.

66212651670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136981.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 66212651670 in words is "sixty-six billion, two hundred twelve million, six hundred fifty-one thousand, six hundred seventy".