215660550 has 48 divisors (see below), whose sum is σ = 611246592. Its totient is φ = 49293600.

The previous prime is 215660539. The next prime is 215660561. The reversal of 215660550 is 55066512.

It is an interprime number because it is at equal distance from previous prime (215660539) and next prime (215660561).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101646 + ... + 103745.

It is an arithmetic number, because the mean of its divisors is an integer number (12734304).

Almost surely, 2^215660550 is an apocalyptic number.

215660550 is an abundant number, since it is smaller than the sum of its proper divisors (395586042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215660550 is a wasteful number, since it uses less digits than its factorization.

215660550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205413 (or 205408 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 215660550 is about 14685.3855924862. The cubic root of 215660550 is about 599.6855296539.

The spelling of 215660550 in words is "two hundred fifteen million, six hundred sixty thousand, five hundred fifty".