1616634065 has 4 divisors (see below), whose sum is σ = 1939960884. Its totient is φ = 1293307248.

The previous prime is 1616634049. The next prime is 1616634073. The reversal of 1616634065 is 5604366161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5604366161 = 1129 ⋅4964009.

It can be written as a sum of positive squares in 2 ways, for example, as 659102929 + 957531136 = 25673^2 + 30944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616634065 - 2⁴ = 1616634049 is a prime.

It is a super-2 number, since 2×1616634065² = 5227011400236848450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161663402 + ... + 161663411.

It is an arithmetic number, because the mean of its divisors is an integer number (484990221).

Almost surely, 2^1616634065 is an apocalyptic number.

It is an amenable number.

1616634065 is a deficient number, since it is larger than the sum of its proper divisors (323326819).

1616634065 is an equidigital number, since it uses as much as digits as its factorization.

1616634065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323326818.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1616634065 is about 40207.3881892371. The cubic root of 1616634065 is about 1173.6463215599.

The spelling of 1616634065 in words is "one billion, six hundred sixteen million, six hundred thirty-four thousand, sixty-five".