215543651155 has 32 divisors (see below), whose sum is σ = 315660349440. Its totient is φ = 138101362560.

The previous prime is 215543651137. The next prime is 215543651171. The reversal of 215543651155 is 551156345512.

It is a happy number.

It is not a de Polignac number, because 215543651155 - 2⁵ = 215543651123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3393669 + ... + 3456598.

It is an arithmetic number, because the mean of its divisors is an integer number (9864385920).

Almost surely, 2^215543651155 is an apocalyptic number.

215543651155 is a deficient number, since it is larger than the sum of its proper divisors (100116698285).

215543651155 is a wasteful number, since it uses less digits than its factorization.

215543651155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850339.

The product of its digits is 450000, while the sum is 43.

Adding to 215543651155 its reverse (551156345512), we get a palindrome (766699996667).

The spelling of 215543651155 in words is "two hundred fifteen billion, five hundred forty-three million, six hundred fifty-one thousand, one hundred fifty-five".