215206512072055 has 16 divisors (see below), whose sum is σ = 297121167201600. Its totient is φ = 146579775812352.

The previous prime is 215206512072053. The next prime is 215206512072073. The reversal of 215206512072055 is 550270215602512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215206512072055 - 2¹ = 215206512072053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215206512072053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20633409174 + ... + 20633419603.

It is an arithmetic number, because the mean of its divisors is an integer number (18570072950100).

Almost surely, 2^{215206512072055} is an apocalyptic number.

215206512072055 is a deficient number, since it is larger than the sum of its proper divisors (81914655129545).

215206512072055 is a wasteful number, since it uses less digits than its factorization.

215206512072055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41266828938.

The product of its (nonzero) digits is 420000, while the sum is 43.

Adding to 215206512072055 its reverse (550270215602512), we get a palindrome (765476727674567).

The spelling of 215206512072055 in words is "two hundred fifteen trillion, two hundred six billion, five hundred twelve million, seventy-two thousand, fifty-five".