1644666134466 has 16 divisors (see below), whose sum is σ = 3359318062464. Its totient is φ = 536557745904.

The previous prime is 1644666134417. The next prime is 1644666134467. The reversal of 1644666134466 is 6644316664461.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1644666134467) 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, 2916074425 + ... + 2916074988.

It is an arithmetic number, because the mean of its divisors is an integer number (209957378904).

Almost surely, 2^{1644666134466} is an apocalyptic number.

1644666134466 is an abundant number, since it is smaller than the sum of its proper divisors (1714651927998).

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

1644666134466 is a wasteful number, since it uses less digits than its factorization.

1644666134466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832149465.

The product of its digits is 35831808, while the sum is 57.

The spelling of 1644666134466 in words is "one trillion, six hundred forty-four billion, six hundred sixty-six million, one hundred thirty-four thousand, four hundred sixty-six".