The square root of 85661582400 is 292680.
85661582400 is a `hidden beast` number, since 8 + 5 + 6 + 61 + 582 + 4 + 0 + 0 = 666.
It is an unprimeable number.
Almost surely, 285661582400 is an apocalyptic number.
85661582400 is a gapful number since it is divisible by the number (80) formed by its first and last digit.
85661582400 is the 292680-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 85661582400
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
85661582400 is an frugal number, since it uses more digits than its factorization.
85661582400 is an evil number, because the sum of its binary digits is even.
The spelling of 85661582400 in words is "eighty-five billion, six hundred sixty-one million, five hundred eighty-two thousand, four hundred".