66380226442 has 4 divisors (see below), whose sum is σ = 99570339666. Its totient is φ = 33190113220.

The previous prime is 66380226391. The next prime is 66380226443. The reversal of 66380226442 is 24462208366.

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

It can be written as a sum of positive squares in only one way, i.e., 65075499801 + 1304726641 = 255099^2 + 36121^2 .

It is not an unprimeable number, because it can be changed into a prime (66380226443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16595056609 + ... + 16595056612.

Almost surely, 2^66380226442 is an apocalyptic number.

66380226442 is a deficient number, since it is larger than the sum of its proper divisors (33190113224).

66380226442 is a wasteful number, since it uses less digits than its factorization.

66380226442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33190113223.

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 66380226442 in words is "sixty-six billion, three hundred eighty million, two hundred twenty-six thousand, four hundred forty-two".