61856618076 has 36 divisors (see below), whose sum is σ = 170574311544. Its totient is φ = 18744429600.

The previous prime is 61856618023. The next prime is 61856618077. The reversal of 61856618076 is 67081665816.

61856618076 is a `hidden beast` number, since 6 + 1 + 8 + 566 + 1 + 8 + 0 + 76 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61856618077) by changing a digit.

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, 78101395 + ... + 78102186.

Almost surely, 2^61856618076 is an apocalyptic number.

61856618076 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61856618076 is an abundant number, since it is smaller than the sum of its proper divisors (108717693468).

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

61856618076 is a wasteful number, since it uses less digits than its factorization.

61856618076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156203602 (or 156203597 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 61856618076 in words is "sixty-one billion, eight hundred fifty-six million, six hundred eighteen thousand, seventy-six".