61009999988 has 12 divisors (see below), whose sum is σ = 122020000032. Its totient is φ = 26147142840.

The previous prime is 61009999949. The next prime is 61010000041. The reversal of 61009999988 is 88999990016.

61009999988 is an admirable number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1089464258 + ... + 1089464313.

It is an arithmetic number, because the mean of its divisors is an integer number (10168333336).

Almost surely, 2^61009999988 is an apocalyptic number.

It is an amenable number.

61009999988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61009999988 is a wasteful number, since it uses less digits than its factorization.

61009999988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178928582 (or 2178928580 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 68.

The spelling of 61009999988 in words is "sixty-one billion, nine million, nine hundred ninety-nine thousand, nine hundred eighty-eight".