215284044861 has 8 divisors (see below), whose sum is σ = 318939325760. Its totient is φ = 143522696556.

The previous prime is 215284044847. The next prime is 215284044881. The reversal of 215284044861 is 168440482512.

215284044861 is a `hidden beast` number, since 2 + 1 + 528 + 4 + 0 + 44 + 86 + 1 = 666.

It is not a de Polignac number, because 215284044861 - 2⁷ = 215284044733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215284044821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3986741545 + ... + 3986741598.

It is an arithmetic number, because the mean of its divisors is an integer number (39867415720).

Almost surely, 2^215284044861 is an apocalyptic number.

It is an amenable number.

215284044861 is a deficient number, since it is larger than the sum of its proper divisors (103655280899).

215284044861 is an equidigital number, since it uses as much as digits as its factorization.

215284044861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7973483152 (or 7973483146 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 45.

The spelling of 215284044861 in words is "two hundred fifteen billion, two hundred eighty-four million, forty-four thousand, eight hundred sixty-one".