56121819156 has 72 divisors (see below), whose sum is σ = 153229835304. Its totient is φ = 17216962560.

The previous prime is 56121819121. The next prime is 56121819191. The reversal of 56121819156 is 65191812165.

56121819156 is a `hidden beast` number, since 5 + 612 + 1 + 8 + 19 + 15 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (56121819121) and next prime (56121819191).

It can be written as a sum of positive squares in 4 ways, for example, as 9688464900 + 46433354256 = 98430^2 + 215484^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20205 + ... + 335636.

It is an arithmetic number, because the mean of its divisors is an integer number (2128192157).

Almost surely, 2^56121819156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56121819156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76614917652).

56121819156 is an abundant number, since it is smaller than the sum of its proper divisors (97108016148).

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

56121819156 is a wasteful number, since it uses less digits than its factorization.

56121819156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356201 (or 356196 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The spelling of 56121819156 in words is "fifty-six billion, one hundred twenty-one million, eight hundred nineteen thousand, one hundred fifty-six".