31555894356 has 192 divisors, whose sum is σ = 98488320000. Its totient is φ = 8724814560.

The previous prime is 31555894313. The next prime is 31555894451. The reversal of 31555894356 is 65349855513.

31555894356 is a `hidden beast` number, since 3 + 1 + 5 + 5 + 589 + 4 + 3 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 63 ways as a sum of consecutive naturals, for example, 1134625 + ... + 1162103.

It is an arithmetic number, because the mean of its divisors is an integer number (512960000).

Almost surely, 2^31555894356 is an apocalyptic number.

31555894356 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31555894356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49244160000).

31555894356 is an abundant number, since it is smaller than the sum of its proper divisors (66932425644).

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

31555894356 is a wasteful number, since it uses less digits than its factorization.

31555894356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27544 (or 27522 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 54.

The spelling of 31555894356 in words is "thirty-one billion, five hundred fifty-five million, eight hundred ninety-four thousand, three hundred fifty-six".