215540410068 has 72 divisors (see below), whose sum is σ = 559823199936. Its totient is φ = 69884640000.

The previous prime is 215540410039. The next prime is 215540410073. The reversal of 215540410068 is 860014045512.

It is a happy number.

215540410068 is a `hidden beast` number, since 2 + 1 + 5 + 540 + 4 + 100 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 84193 + ... + 661943.

Almost surely, 2^215540410068 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 215540410068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279911599968).

215540410068 is an abundant number, since it is smaller than the sum of its proper divisors (344282789868).

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

215540410068 is a wasteful number, since it uses less digits than its factorization.

215540410068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578045 (or 578040 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 215540410068 in words is "two hundred fifteen billion, five hundred forty million, four hundred ten thousand, sixty-eight".