61115643 has 12 divisors (see below), whose sum is σ = 88499320. Its totient is φ = 40641696.

The previous prime is 61115641. The next prime is 61115653. The reversal of 61115643 is 34651116.

61115643 is a `hidden beast` number, since 6 + 1 + 1 + 15 + 643 = 666.

It is not a de Polignac number, because 61115643 - 2¹ = 61115641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61115641) 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, 4621 + ... + 11982.

Almost surely, 2^61115643 is an apocalyptic number.

61115643 is a deficient number, since it is larger than the sum of its proper divisors (27383677).

61115643 is a wasteful number, since it uses less digits than its factorization.

61115643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17018 (or 17015 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 61115643 is about 7817.6494549193. The cubic root of 61115643 is about 393.8983199356.

Adding to 61115643 its reverse (34651116), we get a palindrome (95766759).

The spelling of 61115643 in words is "sixty-one million, one hundred fifteen thousand, six hundred forty-three".