215645360655 has 32 divisors (see below), whose sum is σ = 366121280448. Its totient is φ = 108010649600.

The previous prime is 215645360627. The next prime is 215645360657. The reversal of 215645360655 is 556063546512.

215645360655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215645360655 - 2⁶ = 215645360591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215645360657) 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 31 ways as a sum of consecutive naturals, for example, 799656 + ... + 1034765.

It is an arithmetic number, because the mean of its divisors is an integer number (11441290014).

Almost surely, 2^215645360655 is an apocalyptic number.

215645360655 is a deficient number, since it is larger than the sum of its proper divisors (150475919793).

215645360655 is a wasteful number, since it uses less digits than its factorization.

215645360655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834907.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 215645360655 in words is "two hundred fifteen billion, six hundred forty-five million, three hundred sixty thousand, six hundred fifty-five".