216651502155 has 16 divisors (see below), whose sum is σ = 378155349504. Its totient is φ = 105043152480.

The previous prime is 216651502127. The next prime is 216651502261. The reversal of 216651502155 is 551205156612.

It is not a de Polignac number, because 216651502155 - 2⁶ = 216651502091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656519539 + ... + 656519868.

It is an arithmetic number, because the mean of its divisors is an integer number (23634709344).

Almost surely, 2^216651502155 is an apocalyptic number.

216651502155 is a deficient number, since it is larger than the sum of its proper divisors (161503847349).

216651502155 is a wasteful number, since it uses less digits than its factorization.

216651502155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313039426.

The product of its (nonzero) digits is 90000, while the sum is 39.

Adding to 216651502155 its reverse (551205156612), we get a palindrome (767856658767).

The spelling of 216651502155 in words is "two hundred sixteen billion, six hundred fifty-one million, five hundred two thousand, one hundred fifty-five".