66126002811021 has 16 divisors (see below), whose sum is σ = 98025638209920. Its totient is φ = 44056466553600.

The previous prime is 66126002810983. The next prime is 66126002811049. The reversal of 66126002811021 is 12011820062166.

It is a happy number.

66126002811021 is a `hidden beast` number, since 6 + 6 + 1 + 2 + 600 + 28 + 1 + 1 + 0 + 21 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-66126002811021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66126002818021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 764825985 + ... + 764912438.

It is an arithmetic number, because the mean of its divisors is an integer number (6126602388120).

Almost surely, 2^{66126002811021} is an apocalyptic number.

It is an amenable number.

66126002811021 is a deficient number, since it is larger than the sum of its proper divisors (31899635398899).

66126002811021 is a wasteful number, since it uses less digits than its factorization.

66126002811021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529740033 (or 1529740027 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

Adding to 66126002811021 its reverse (12011820062166), we get a palindrome (78137822873187).

The spelling of 66126002811021 in words is "sixty-six trillion, one hundred twenty-six billion, two million, eight hundred eleven thousand, twenty-one".