215065655 has 48 divisors (see below), whose sum is σ = 323066880. Its totient is φ = 136600128.

The previous prime is 215065651. The next prime is 215065667. The reversal of 215065655 is 556560512.

215065655 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 215065655 - 2² = 215065651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215065651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218294 + ... + 219276.

It is an arithmetic number, because the mean of its divisors is an integer number (6730560).

Almost surely, 2^215065655 is an apocalyptic number.

215065655 is a deficient number, since it is larger than the sum of its proper divisors (108001225).

215065655 is a wasteful number, since it uses less digits than its factorization.

215065655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1061 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 215065655 is about 14665.1169446411. The cubic root of 215065655 is about 599.1336153055.

The spelling of 215065655 in words is "two hundred fifteen million, sixty-five thousand, six hundred fifty-five".