215819654164 has 12 divisors (see below), whose sum is σ = 386896209588. Its totient is φ = 105277880000.

The previous prime is 215819654161. The next prime is 215819654269. The reversal of 215819654164 is 461456918512.

215819654164 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 104657426064 + 111162228100 = 323508^2 + 333410^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215819654161) by changing a digit.

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, 657986587 + ... + 657986914.

It is an arithmetic number, because the mean of its divisors is an integer number (32241350799).

Almost surely, 2^215819654164 is an apocalyptic number.

It is an amenable number.

215819654164 is a deficient number, since it is larger than the sum of its proper divisors (171076555424).

215819654164 is a wasteful number, since it uses less digits than its factorization.

215819654164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315973546 (or 1315973544 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 52.

The spelling of 215819654164 in words is "two hundred fifteen billion, eight hundred nineteen million, six hundred fifty-four thousand, one hundred sixty-four".