215407864650 has 192 divisors, whose sum is σ = 589418274816. Its totient is φ = 51628320000.

The previous prime is 215407864631. The next prime is 215407864681. The reversal of 215407864650 is 56468704512.

215407864650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 215407864650.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 55558512 + ... + 55562388.

It is an arithmetic number, because the mean of its divisors is an integer number (3069886848).

Almost surely, 2^215407864650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215407864650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294709137408).

215407864650 is an abundant number, since it is smaller than the sum of its proper divisors (374010410166).

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

215407864650 is a wasteful number, since it uses less digits than its factorization.

215407864650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4277 (or 4272 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 215407864650 in words is "two hundred fifteen billion, four hundred seven million, eight hundred sixty-four thousand, six hundred fifty".