66050071021 has 4 divisors (see below), whose sum is σ = 72054622944. Its totient is φ = 60045519100.

The previous prime is 66050071007. The next prime is 66050071057. The reversal of 66050071021 is 12017005066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66050071021 - 2¹³ = 66050062829 is a prime.

It is a super-2 number, since 2×66050071021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66050071421) 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 3 ways as a sum of consecutive naturals, for example, 3002275945 + ... + 3002275966.

It is an arithmetic number, because the mean of its divisors is an integer number (18013655736).

Almost surely, 2^66050071021 is an apocalyptic number.

It is an amenable number.

66050071021 is a deficient number, since it is larger than the sum of its proper divisors (6004551923).

66050071021 is a wasteful number, since it uses less digits than its factorization.

66050071021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6004551922.

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 66050071021 its reverse (12017005066), we get a palindrome (78067076087).

The spelling of 66050071021 in words is "sixty-six billion, fifty million, seventy-one thousand, twenty-one".