61556556156 has 12 divisors (see below), whose sum is σ = 143631964392. Its totient is φ = 20518852048.

The previous prime is 61556556137. The next prime is 61556556169. The reversal of 61556556156 is 65165565516.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 61556556099 and 61556556108.

It is a congruent number.

It is an unprimeable number.

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, 2564856495 + ... + 2564856518.

It is an arithmetic number, because the mean of its divisors is an integer number (11969330366).

Almost surely, 2^61556556156 is an apocalyptic number.

It is an amenable number.

61556556156 is an abundant number, since it is smaller than the sum of its proper divisors (82075408236).

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

61556556156 is a wasteful number, since it uses less digits than its factorization.

61556556156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129713020 (or 5129713018 counting only the distinct ones).

The product of its digits is 4050000, while the sum is 51.

The spelling of 61556556156 in words is "sixty-one billion, five hundred fifty-six million, five hundred fifty-six thousand, one hundred fifty-six".