215821483668 has 192 divisors, whose sum is σ = 642829824000. Its totient is φ = 61340416128.

The previous prime is 215821483663. The next prime is 215821483693. The reversal of 215821483668 is 866384128512.

215821483668 is a `hidden beast` number, since 2 + 158 + 2 + 1 + 483 + 6 + 6 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215821483663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 147923523 + ... + 147924981.

It is an arithmetic number, because the mean of its divisors is an integer number (3348072000).

Almost surely, 2^215821483668 is an apocalyptic number.

215821483668 is a gapful number since it is divisible by the number (28) 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 215821483668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321414912000).

215821483668 is an abundant number, since it is smaller than the sum of its proper divisors (427008340332).

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

215821483668 is a wasteful number, since it uses less digits than its factorization.

215821483668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371 (or 2363 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 54.

The spelling of 215821483668 in words is "two hundred fifteen billion, eight hundred twenty-one million, four hundred eighty-three thousand, six hundred sixty-eight".