666244454145654 has 64 divisors (see below), whose sum is σ = 1423429703133120. Its totient is φ = 207157452472320.

The previous prime is 666244454145629. The next prime is 666244454145661. The reversal of 666244454145654 is 456541454442666.

It is a happy number.

666244454145654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223147234 + ... + 226113194.

It is an arithmetic number, because the mean of its divisors is an integer number (22241089111455).

Almost surely, 2^{666244454145654} is an apocalyptic number.

666244454145654 is an abundant number, since it is smaller than the sum of its proper divisors (757185248987466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666244454145654 is a wasteful number, since it uses less digits than its factorization.

666244454145654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985585.

The product of its digits is 1327104000, while the sum is 66.

The spelling of 666244454145654 in words is "six hundred sixty-six trillion, two hundred forty-four billion, four hundred fifty-four million, one hundred forty-five thousand, six hundred fifty-four".