61105870887 has 4 divisors (see below), whose sum is σ = 81474494520. Its totient is φ = 40737247256.

The previous prime is 61105870879. The next prime is 61105870901. The reversal of 61105870887 is 78807850116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61105870887 - 2³ = 61105870879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61105870877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10184311812 + ... + 10184311817.

It is an arithmetic number, because the mean of its divisors is an integer number (20368623630).

Almost surely, 2^61105870887 is an apocalyptic number.

61105870887 is a deficient number, since it is larger than the sum of its proper divisors (20368623633).

61105870887 is a wasteful number, since it uses less digits than its factorization.

61105870887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20368623632.

The product of its (nonzero) digits is 752640, while the sum is 51.

The spelling of 61105870887 in words is "sixty-one billion, one hundred five million, eight hundred seventy thousand, eight hundred eighty-seven".