1645200671 has 8 divisors (see below), whose sum is σ = 1778596080. Its totient is φ = 1516485888.

The previous prime is 1645200647. The next prime is 1645200679. The reversal of 1645200671 is 1760025461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1645200671 - 2³⁰ = 571458847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645200679) 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, 1169426 + ... + 1170831.

It is an arithmetic number, because the mean of its divisors is an integer number (222324510).

Almost surely, 2^1645200671 is an apocalyptic number.

1645200671 is a deficient number, since it is larger than the sum of its proper divisors (133395409).

1645200671 is a wasteful number, since it uses less digits than its factorization.

1645200671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340313.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1645200671 is about 40561.0733462516. The cubic root of 1645200671 is about 1180.5189403288.

The spelling of 1645200671 in words is "one billion, six hundred forty-five million, two hundred thousand, six hundred seventy-one".