66838881374 has 4 divisors (see below), whose sum is σ = 100258322064. Its totient is φ = 33419440686.

The previous prime is 66838881311. The next prime is 66838881407. The reversal of 66838881374 is 47318883866.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16709720342 + ... + 16709720345.

It is an arithmetic number, because the mean of its divisors is an integer number (25064580516).

Almost surely, 2^66838881374 is an apocalyptic number.

66838881374 is a deficient number, since it is larger than the sum of its proper divisors (33419440690).

66838881374 is a wasteful number, since it uses less digits than its factorization.

66838881374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33419440689.

The product of its digits is 37158912, while the sum is 62.

The spelling of 66838881374 in words is "sixty-six billion, eight hundred thirty-eight million, eight hundred eighty-one thousand, three hundred seventy-four".