1643425115 has 8 divisors (see below), whose sum is σ = 2025410640. Its totient is φ = 1279206432.

The previous prime is 1643425093. The next prime is 1643425163. The reversal of 1643425115 is 5115243461.

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 1643425115 - 2¹⁰ = 1643424091 is a prime.

It is a super-2 number, since 2×1643425115² = 5401692217225526450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4441505 + ... + 4441874.

It is an arithmetic number, because the mean of its divisors is an integer number (253176330).

Almost surely, 2^1643425115 is an apocalyptic number.

1643425115 is a deficient number, since it is larger than the sum of its proper divisors (381985525).

1643425115 is an equidigital number, since it uses as much as digits as its factorization.

1643425115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8883421.

The product of its digits is 14400, while the sum is 32.

The square root of 1643425115 is about 40539.1799991070. The cubic root of 1643425115 is about 1180.0941021861.

Adding to 1643425115 its reverse (5115243461), we get a palindrome (6758668576).

The spelling of 1643425115 in words is "one billion, six hundred forty-three million, four hundred twenty-five thousand, one hundred fifteen".