61431163556 has 12 divisors (see below), whose sum is σ = 122862327168. Its totient is φ = 26327641512.

The previous prime is 61431163537. The next prime is 61431163561. The reversal of 61431163556 is 65536113416.

61431163556 is an admirable 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, 1096985036 + ... + 1096985091.

It is an arithmetic number, because the mean of its divisors is an integer number (10238527264).

Almost surely, 2^61431163556 is an apocalyptic number.

It is an amenable number.

61431163556 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.

61431163556 is a wasteful number, since it uses less digits than its factorization.

61431163556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193970138 (or 2193970136 counting only the distinct ones).

The product of its digits is 194400, while the sum is 41.

The spelling of 61431163556 in words is "sixty-one billion, four hundred thirty-one million, one hundred sixty-three thousand, five hundred fifty-six".