1645742562171 has 16 divisors (see below), whose sum is σ = 2199405717120. Its totient is φ = 1094620849920.

The previous prime is 1645742562103. The next prime is 1645742562227. The reversal of 1645742562171 is 1712652475461.

It is a happy number.

It is not a de Polignac number, because 1645742562171 - 2¹³ = 1645742553979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645742567171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36340140 + ... + 36385398.

It is an arithmetic number, because the mean of its divisors is an integer number (137462857320).

Almost surely, 2^{1645742562171} is an apocalyptic number.

1645742562171 is a deficient number, since it is larger than the sum of its proper divisors (553663154949).

1645742562171 is a wasteful number, since it uses less digits than its factorization.

1645742562171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73066.

The product of its digits is 2822400, while the sum is 51.

The spelling of 1645742562171 in words is "one trillion, six hundred forty-five billion, seven hundred forty-two million, five hundred sixty-two thousand, one hundred seventy-one".