1642568109 has 32 divisors (see below), whose sum is σ = 2732454144. Its totient is φ = 854530560.

The previous prime is 1642568099. The next prime is 1642568111. The reversal of 1642568109 is 9018652461.

It is not a de Polignac number, because 1642568109 - 2⁴ = 1642568093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642568159) 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, 21282 + ... + 61139.

It is an arithmetic number, because the mean of its divisors is an integer number (85389192).

Almost surely, 2^1642568109 is an apocalyptic number.

It is an amenable number.

1642568109 is a deficient number, since it is larger than the sum of its proper divisors (1089886035).

1642568109 is a wasteful number, since it uses less digits than its factorization.

1642568109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82517.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1642568109 is about 40528.6085253368. The cubic root of 1642568109 is about 1179.8889364491. Note that the first 3 decimals are identical.

The spelling of 1642568109 in words is "one billion, six hundred forty-two million, five hundred sixty-eight thousand, one hundred nine".