1616583861 has 12 divisors (see below), whose sum is σ = 2359139692. Its totient is φ = 1066611456.

The previous prime is 1616583851. The next prime is 1616583887. The reversal of 1616583861 is 1683856161.

1616583861 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 583 + 8 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 794901636 + 821682225 = 28194^2 + 28665^2 .

It is not a de Polignac number, because 1616583861 - 2⁶ = 1616583797 is a prime.

It is a super-2 number, since 2×1616583861² = 5226686759291334642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616583841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925006 + ... + 926751.

Almost surely, 2^1616583861 is an apocalyptic number.

It is an amenable number.

1616583861 is a deficient number, since it is larger than the sum of its proper divisors (742555831).

1616583861 is a wasteful number, since it uses less digits than its factorization.

1616583861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851860 (or 1851857 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1616583861 is about 40206.7638712692. The cubic root of 1616583861 is about 1173.6341723768.

The spelling of 1616583861 in words is "one billion, six hundred sixteen million, five hundred eighty-three thousand, eight hundred sixty-one".