66746406021 has 8 divisors (see below), whose sum is σ = 88999297344. Its totient is φ = 44495559360.

The previous prime is 66746406007. The next prime is 66746406071. The reversal of 66746406021 is 12060464766.

It is a happy number.

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

It is not a de Polignac number, because 66746406021 - 2¹⁹ = 66745881733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66746406071) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 433300 + ... + 566781.

It is an arithmetic number, because the mean of its divisors is an integer number (11124912168).

Almost surely, 2^66746406021 is an apocalyptic number.

It is an amenable number.

66746406021 is a deficient number, since it is larger than the sum of its proper divisors (22252891323).

66746406021 is a wasteful number, since it uses less digits than its factorization.

66746406021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022331.

The product of its (nonzero) digits is 290304, while the sum is 42.

The spelling of 66746406021 in words is "sixty-six billion, seven hundred forty-six million, four hundred six thousand, twenty-one".