66403284021 has 12 divisors (see below), whose sum is σ = 97129980480. Its totient is φ = 43708490280.

The previous prime is 66403284011. The next prime is 66403284029. The reversal of 66403284021 is 12048230466.

66403284021 is a `hidden beast` number, since 6 + 640 + 3 + 2 + 8 + 4 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 66403284021 - 2³⁴ = 49223414837 is a prime.

It is a super-2 number, since 2×66403284021² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66403284029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46696395 + ... + 46697816.

It is an arithmetic number, because the mean of its divisors is an integer number (8094165040).

Almost surely, 2^66403284021 is an apocalyptic number.

It is an amenable number.

66403284021 is a deficient number, since it is larger than the sum of its proper divisors (30726696459).

66403284021 is a wasteful number, since it uses less digits than its factorization.

66403284021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93394296 (or 93394293 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 66403284021 in words is "sixty-six billion, four hundred three million, two hundred eighty-four thousand, twenty-one".