66994522674 has 16 divisors (see below), whose sum is σ = 134275965408. Its totient is φ = 22283687552.

The previous prime is 66994522663. The next prime is 66994522687. The reversal of 66994522674 is 47622549966.

It is a super-2 number, since 2×66994522674² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11951967 + ... + 11957570.

It is an arithmetic number, because the mean of its divisors is an integer number (8392247838).

Almost surely, 2^66994522674 is an apocalyptic number.

66994522674 is an abundant number, since it is smaller than the sum of its proper divisors (67281442734).

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

66994522674 is a wasteful number, since it uses less digits than its factorization.

66994522674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23910009.

The product of its digits is 39191040, while the sum is 60.

The spelling of 66994522674 in words is "sixty-six billion, nine hundred ninety-four million, five hundred twenty-two thousand, six hundred seventy-four".