66256424642 has 16 divisors (see below), whose sum is σ = 102818973240. Its totient is φ = 31983595392.

The previous prime is 66256424621. The next prime is 66256424669. The reversal of 66256424642 is 24642465266.

It can be written as a sum of positive squares in 4 ways, for example, as 54596528281 + 11659896361 = 233659^2 + 107981^2 .

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, 1026188 + ... + 1088840.

Almost surely, 2^66256424642 is an apocalyptic number.

66256424642 is a deficient number, since it is larger than the sum of its proper divisors (36562548598).

66256424642 is a wasteful number, since it uses less digits than its factorization.

66256424642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80917.

The product of its digits is 3317760, while the sum is 47.

The spelling of 66256424642 in words is "sixty-six billion, two hundred fifty-six million, four hundred twenty-four thousand, six hundred forty-two".