1646665312 has 24 divisors (see below), whose sum is σ = 3382824816. Its totient is φ = 787535232.

The previous prime is 1646665309. The next prime is 1646665313. The reversal of 1646665312 is 2135666461.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646665313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1117923 + ... + 1119394.

It is an arithmetic number, because the mean of its divisors is an integer number (140951034).

Almost surely, 2^1646665312 is an apocalyptic number.

It is an amenable number.

1646665312 is an abundant number, since it is smaller than the sum of its proper divisors (1736159504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1646665312 is a wasteful number, since it uses less digits than its factorization.

1646665312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237350 (or 2237342 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 1646665312 is about 40579.1240910890. The cubic root of 1646665312 is about 1180.8691556822.

The spelling of 1646665312 in words is "one billion, six hundred forty-six million, six hundred sixty-five thousand, three hundred twelve".