61881610698 has 24 divisors (see below), whose sum is σ = 137346991236. Its totient is φ = 20124100800.

The previous prime is 61881610673. The next prime is 61881610709. The reversal of 61881610698 is 89601618816.

61881610698 is a `hidden beast` number, since 6 + 18 + 8 + 1 + 610 + 6 + 9 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39954812769 + 21926797929 = 199887^2 + 148077^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41924473 + ... + 41925948.

Almost surely, 2^61881610698 is an apocalyptic number.

61881610698 is an abundant number, since it is smaller than the sum of its proper divisors (75465380538).

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

61881610698 is a wasteful number, since it uses less digits than its factorization.

61881610698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83850470 (or 83850467 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 61881610698 in words is "sixty-one billion, eight hundred eighty-one million, six hundred ten thousand, six hundred ninety-eight".