66200406721 has 8 divisors (see below), whose sum is σ = 68346123264. Its totient is φ = 64055328960.

The previous prime is 66200406683. The next prime is 66200406731. The reversal of 66200406721 is 12760400266.

66200406721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 66200406721 - 2⁷ = 66200406593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66200406731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55560 + ... + 368086.

It is an arithmetic number, because the mean of its divisors is an integer number (8543265408).

Almost surely, 2^66200406721 is an apocalyptic number.

It is an amenable number.

66200406721 is a deficient number, since it is larger than the sum of its proper divisors (2145716543).

66200406721 is a wasteful number, since it uses less digits than its factorization.

66200406721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319391.

The product of its (nonzero) digits is 24192, while the sum is 34.

Adding to 66200406721 its reverse (12760400266), we get a palindrome (78960806987).

The spelling of 66200406721 in words is "sixty-six billion, two hundred million, four hundred six thousand, seven hundred twenty-one".