66402126722 has 4 divisors (see below), whose sum is σ = 99603190086. Its totient is φ = 33201063360.

The previous prime is 66402126719. The next prime is 66402126731. The reversal of 66402126722 is 22762120466.

It is a happy number.

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., 35906839081 + 30495287641 = 189491^2 + 174629^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16600531679 + ... + 16600531682.

Almost surely, 2^66402126722 is an apocalyptic number.

66402126722 is a deficient number, since it is larger than the sum of its proper divisors (33201063364).

66402126722 is a wasteful number, since it uses less digits than its factorization.

66402126722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33201063363.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 66402126722 in words is "sixty-six billion, four hundred two million, one hundred twenty-six thousand, seven hundred twenty-two".