1645052851 has 32 divisors (see below), whose sum is σ = 2008903680. Its totient is φ = 1331510400.

The previous prime is 1645052837. The next prime is 1645052867. The reversal of 1645052851 is 1582505461.

It is a cyclic number.

It is not a de Polignac number, because 1645052851 - 2¹³ = 1645044659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645052851.

It is not an unprimeable number, because it can be changed into a prime (1645052831) 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, 171441 + ... + 180781.

It is an arithmetic number, because the mean of its divisors is an integer number (62778240).

Almost surely, 2^1645052851 is an apocalyptic number.

1645052851 is a deficient number, since it is larger than the sum of its proper divisors (363850829).

1645052851 is a wasteful number, since it uses less digits than its factorization.

1645052851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9427.

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 1645052851 is about 40559.2511148813. The cubic root of 1645052851 is about 1180.4835830338.

The spelling of 1645052851 in words is "one billion, six hundred forty-five million, fifty-two thousand, eight hundred fifty-one".