1645432345461 has 32 divisors (see below), whose sum is σ = 2221220413440. Its totient is φ = 1083358152000.

The previous prime is 1645432345421. The next prime is 1645432345477.

1645432345461 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1645432345461 - 2²⁹ = 1644895474549 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645432345461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645432345421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212063700 + ... + 212071458.

It is an arithmetic number, because the mean of its divisors is an integer number (69413137920).

Almost surely, 2^{1645432345461} is an apocalyptic number.

It is an amenable number.

1645432345461 is a deficient number, since it is larger than the sum of its proper divisors (575788067979).

1645432345461 is a wasteful number, since it uses less digits than its factorization.

1645432345461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9537.

The product of its digits is 4147200, while the sum is 48.

The spelling of 1645432345461 in words is "one trillion, six hundred forty-five billion, four hundred thirty-two million, three hundred forty-five thousand, four hundred sixty-one".