1646168138 has 16 divisors (see below), whose sum is σ = 2603142144. Its totient is φ = 779584080.

The previous prime is 1646168137. The next prime is 1646168141. The reversal of 1646168138 is 8318616461.

It is not an unprimeable number, because it can be changed into a prime (1646168131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279545 + ... + 285372.

It is an arithmetic number, because the mean of its divisors is an integer number (162696384).

Almost surely, 2^1646168138 is an apocalyptic number.

1646168138 is a deficient number, since it is larger than the sum of its proper divisors (956974006).

1646168138 is a wasteful number, since it uses less digits than its factorization.

1646168138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564997.

The product of its digits is 165888, while the sum is 44.

The square root of 1646168138 is about 40572.9976462179. The cubic root of 1646168138 is about 1180.7502979855.

The spelling of 1646168138 in words is "one billion, six hundred forty-six million, one hundred sixty-eight thousand, one hundred thirty-eight".