215550722050566 has 16 divisors (see below), whose sum is σ = 492687364687104. Its totient is φ = 61585920585864.

The previous prime is 215550722050549. The next prime is 215550722050567. The reversal of 215550722050566 is 665050227055512.

It is a super-2 number, since 2×215550722050566² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215550722050567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2566080024370 + ... + 2566080024453.

It is an arithmetic number, because the mean of its divisors is an integer number (30792960292944).

Almost surely, 2^{215550722050566} is an apocalyptic number.

215550722050566 is an abundant number, since it is smaller than the sum of its proper divisors (277136642636538).

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

215550722050566 is a wasteful number, since it uses less digits than its factorization.

215550722050566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132160048835.

The product of its (nonzero) digits is 6300000, while the sum is 51.

The spelling of 215550722050566 in words is "two hundred fifteen trillion, five hundred fifty billion, seven hundred twenty-two million, fifty thousand, five hundred sixty-six".