66442136626 has 8 divisors (see below), whose sum is σ = 105525746460. Its totient is φ = 31266887808.

The previous prime is 66442136617. The next prime is 66442136639. The reversal of 66442136626 is 62663124466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62875061001 + 3567075625 = 250749^2 + 59725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977090211 + ... + 977090278.

Almost surely, 2^66442136626 is an apocalyptic number.

66442136626 is a deficient number, since it is larger than the sum of its proper divisors (39083609834).

66442136626 is a wasteful number, since it uses less digits than its factorization.

66442136626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954180508.

The product of its digits is 1492992, while the sum is 46.

The spelling of 66442136626 in words is "sixty-six billion, four hundred forty-two million, one hundred thirty-six thousand, six hundred twenty-six".