1643652145 has 16 divisors (see below), whose sum is σ = 1996747200. Its totient is φ = 1298752704.

The previous prime is 1643652091. The next prime is 1643652163. The reversal of 1643652145 is 5412563461.

It is a cyclic number.

It is not a de Polignac number, because 1643652145 - 2¹⁷ = 1643521073 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182314 + ... + 191116.

It is an arithmetic number, because the mean of its divisors is an integer number (124796700).

Almost surely, 2^1643652145 is an apocalyptic number.

It is an amenable number.

1643652145 is a deficient number, since it is larger than the sum of its proper divisors (353095055).

1643652145 is a wasteful number, since it uses less digits than its factorization.

1643652145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9264.

The product of its digits is 86400, while the sum is 37.

The square root of 1643652145 is about 40541.9800330472. The cubic root of 1643652145 is about 1180.1484408202.

The spelling of 1643652145 in words is "one billion, six hundred forty-three million, six hundred fifty-two thousand, one hundred forty-five".