215666502052 has 12 divisors (see below), whose sum is σ = 384537442716. Its totient is φ = 105798661280.

The previous prime is 215666502041. The next prime is 215666502061. The reversal of 215666502052 is 250205666512.

215666502052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 146731899136 + 68934602916 = 383056^2 + 262554^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215666501996 and 215666502014.

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 3 ways as a sum of consecutive naturals, for example, 508647199 + ... + 508647622.

It is an arithmetic number, because the mean of its divisors is an integer number (32044786893).

Almost surely, 2^215666502052 is an apocalyptic number.

It is an amenable number.

215666502052 is a deficient number, since it is larger than the sum of its proper divisors (168870940664).

215666502052 is a wasteful number, since it uses less digits than its factorization.

215666502052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017294878 (or 1017294876 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 215666502052 in words is "two hundred fifteen billion, six hundred sixty-six million, five hundred two thousand, fifty-two".