1643425118 has 16 divisors (see below), whose sum is σ = 2577591936. Its totient is φ = 784374360.

The previous prime is 1643425093. The next prime is 1643425163. The reversal of 1643425118 is 8115243461.

It is a super-2 number, since 2×1643425118² = 5401692236946627848, which contains 22 as substring.

It is a congruent number.

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, 13796 + ... + 58967.

It is an arithmetic number, because the mean of its divisors is an integer number (161099496).

Almost surely, 2^1643425118 is an apocalyptic number.

1643425118 is a deficient number, since it is larger than the sum of its proper divisors (934166818).

1643425118 is a wasteful number, since it uses less digits than its factorization.

1643425118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73279.

The product of its digits is 23040, while the sum is 35.

The square root of 1643425118 is about 40539.1800361083. The cubic root of 1643425118 is about 1180.0941029041.

Adding to 1643425118 its reverse (8115243461), we get a palindrome (9758668579).

The spelling of 1643425118 in words is "one billion, six hundred forty-three million, four hundred twenty-five thousand, one hundred eighteen".