1645612166466 has 20 divisors (see below), whose sum is σ = 3687390225222. Its totient is φ = 548537388768.

The previous prime is 1645612166461. The next prime is 1645612166477. The reversal of 1645612166466 is 6646612165461.

It is a happy number.

1645612166466 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 6 + 12 + 166 + 466 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1064250140625 + 581362025841 = 1031625^2 + 762471^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1645612166461) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5079049735 + ... + 5079050058.

Almost surely, 2^{1645612166466} is an apocalyptic number.

1645612166466 is an abundant number, since it is smaller than the sum of its proper divisors (2041778058756).

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

1645612166466 is a wasteful number, since it uses less digits than its factorization.

1645612166466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10158099807 (or 10158099798 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 1645612166466 in words is "one trillion, six hundred forty-five billion, six hundred twelve million, one hundred sixty-six thousand, four hundred sixty-six".