66221406344246 has 16 divisors (see below), whose sum is σ = 99375598867776. Its totient is φ = 33096207203136.

The previous prime is 66221406344237. The next prime is 66221406344389. The reversal of 66221406344246 is 64244360412266.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66221406344194 and 66221406344203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487725800 + ... + 487861556.

It is an arithmetic number, because the mean of its divisors is an integer number (6210974929236).

Almost surely, 2^{66221406344246} is an apocalyptic number.

66221406344246 is a deficient number, since it is larger than the sum of its proper divisors (33154192523530).

66221406344246 is a wasteful number, since it uses less digits than its factorization.

66221406344246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240743.

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 66221406344246 in words is "sixty-six trillion, two hundred twenty-one billion, four hundred six million, three hundred forty-four thousand, two hundred forty-six".