1645161071 has 4 divisors (see below), whose sum is σ = 1645312152. Its totient is φ = 1645009992.

The previous prime is 1645161047. The next prime is 1645161083. The reversal of 1645161071 is 1701615461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1645161071 - 2¹⁴ = 1645144687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645161571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57821 + ... + 81446.

It is an arithmetic number, because the mean of its divisors is an integer number (411328038).

Almost surely, 2^1645161071 is an apocalyptic number.

1645161071 is a deficient number, since it is larger than the sum of its proper divisors (151081).

1645161071 is a wasteful number, since it uses less digits than its factorization.

1645161071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151080.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1645161071 is about 40560.5851905517. The cubic root of 1645161071 is about 1180.5094685511.

The spelling of 1645161071 in words is "one billion, six hundred forty-five million, one hundred sixty-one thousand, seventy-one".