215452655 has 16 divisors (see below), whose sum is σ = 283522464. Its totient is φ = 155873280.

The previous prime is 215452651. The next prime is 215452669. The reversal of 215452655 is 556254512.

It is not a de Polignac number, because 215452655 - 2² = 215452651 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 (215452651) 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 15 ways as a sum of consecutive naturals, for example, 467 + ... + 20763.

It is an arithmetic number, because the mean of its divisors is an integer number (17720154).

Almost surely, 2^215452655 is an apocalyptic number.

215452655 is a deficient number, since it is larger than the sum of its proper divisors (68069809).

215452655 is a wasteful number, since it uses less digits than its factorization.

215452655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20506.

The product of its digits is 60000, while the sum is 35.

The square root of 215452655 is about 14678.3055902240. The cubic root of 215452655 is about 599.4927703918.

The spelling of 215452655 in words is "two hundred fifteen million, four hundred fifty-two thousand, six hundred fifty-five".