61281863888 has 40 divisors (see below), whose sum is σ = 135707171328. Its totient is φ = 26261407872.

The previous prime is 61281863861. The next prime is 61281863893. The reversal of 61281863888 is 88836818216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2485670 + ... + 2510202.

Almost surely, 2^61281863888 is an apocalyptic number.

It is an amenable number.

61281863888 is an abundant number, since it is smaller than the sum of its proper divisors (74425307440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61281863888 is a wasteful number, since it uses less digits than its factorization.

61281863888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46851 (or 46845 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 59.

The spelling of 61281863888 in words is "sixty-one billion, two hundred eighty-one million, eight hundred sixty-three thousand, eight hundred eighty-eight".