66888740682 has 40 divisors (see below), whose sum is σ = 149902858116. Its totient is φ = 22292895168.

The previous prime is 66888740573. The next prime is 66888740693. The reversal of 66888740682 is 28604788866.

It can be written as a sum of positive squares in 2 ways, for example, as 52385596641 + 14503144041 = 228879^2 + 120429^2 .

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 19 ways as a sum of consecutive naturals, for example, 1200228 + ... + 1254720.

Almost surely, 2^66888740682 is an apocalyptic number.

66888740682 is an abundant number, since it is smaller than the sum of its proper divisors (83014117434).

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

66888740682 is a wasteful number, since it uses less digits than its factorization.

66888740682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62084 (or 62075 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 63.

The spelling of 66888740682 in words is "sixty-six billion, eight hundred eighty-eight million, seven hundred forty thousand, six hundred eighty-two".