215382953853 has 20 divisors (see below), whose sum is σ = 321792766108. Its totient is φ = 143567277120.

The previous prime is 215382953809. The next prime is 215382953867. The reversal of 215382953853 is 358359283512.

It is a happy number.

215382953853 is a `hidden beast` number, since 2 + 1 + 5 + 38 + 29 + 538 + 53 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 62406534969 + 152976418884 = 249813^2 + 391122^2 .

It is not a de Polignac number, because 215382953853 - 2³⁴ = 198203084669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215382953853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215382953873) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 359775 + ... + 748467.

Almost surely, 2^215382953853 is an apocalyptic number.

It is an amenable number.

215382953853 is a deficient number, since it is larger than the sum of its proper divisors (106409812255).

215382953853 is an equidigital number, since it uses as much as digits as its factorization.

215382953853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395546 (or 395537 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The spelling of 215382953853 in words is "two hundred fifteen billion, three hundred eighty-two million, nine hundred fifty-three thousand, eight hundred fifty-three".