1616433665 has 16 divisors (see below), whose sum is σ = 2418353280. Its totient is φ = 1007646720.

The previous prime is 1616433619. The next prime is 1616433691. The reversal of 1616433665 is 5663346161.

It is not a de Polignac number, because 1616433665 - 2²⁴ = 1599656449 is a prime.

It is a super-2 number, since 2×1616433665² = 5225715586690664450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2098880 + ... + 2099649.

It is an arithmetic number, because the mean of its divisors is an integer number (151147080).

Almost surely, 2^1616433665 is an apocalyptic number.

It is an amenable number.

1616433665 is a deficient number, since it is larger than the sum of its proper divisors (801919615).

1616433665 is a wasteful number, since it uses less digits than its factorization.

1616433665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198552.

The product of its digits is 233280, while the sum is 41.

The square root of 1616433665 is about 40204.8960326973. The cubic root of 1616433665 is about 1173.5978239959.

The spelling of 1616433665 in words is "one billion, six hundred sixteen million, four hundred thirty-three thousand, six hundred sixty-five".