115621863156540 has 480 divisors, whose sum is σ = 391386992156160. Its totient is φ = 28404278429184.

The previous prime is 115621863156509. The next prime is 115621863156647. The reversal of 115621863156540 is 45651368126511.

It is a happy number.

115621863156540 is a `hidden beast` number, since 1 + 1 + 5 + 6 + 2 + 1 + 8 + 6 + 31 + 565 + 40 = 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 polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 32487175281 + ... + 32487178839.

It is an arithmetic number, because the mean of its divisors is an integer number (815389566992).

Almost surely, 2^{115621863156540} is an apocalyptic number.

115621863156540 is a gapful number since it is divisible by the number (10) 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 115621863156540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195693496078080).

115621863156540 is an abundant number, since it is smaller than the sum of its proper divisors (275765128999620).

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

115621863156540 is a wasteful number, since it uses less digits than its factorization.

115621863156540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6223 (or 6212 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 54.

The spelling of 115621863156540 in words is "one hundred fifteen trillion, six hundred twenty-one billion, eight hundred sixty-three million, one hundred fifty-six thousand, five hundred forty".