66667951674 has 24 divisors (see below), whose sum is σ = 144452004372. Its totient is φ = 22221915840.

The previous prime is 66667951673. The next prime is 66667951733. The reversal of 66667951674 is 47615976666.

It can be written as a sum of positive squares in 2 ways, for example, as 64026711225 + 2641240449 = 253035^2 + 51393^2 .

It is not an unprimeable number, because it can be changed into a prime (66667951673) 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 11 ways as a sum of consecutive naturals, for example, 947412 + ... + 1015344.

Almost surely, 2^66667951674 is an apocalyptic number.

66667951674 is an abundant number, since it is smaller than the sum of its proper divisors (77784052698).

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

66667951674 is a wasteful number, since it uses less digits than its factorization.

66667951674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122462 (or 122459 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 63.

The spelling of 66667951674 in words is "sixty-six billion, six hundred sixty-seven million, nine hundred fifty-one thousand, six hundred seventy-four".