216657271555 has 16 divisors (see below), whose sum is σ = 265349910240. Its totient is φ = 169772908032.

The previous prime is 216657271547. The next prime is 216657271603. The reversal of 216657271555 is 555172756612.

It is a happy number.

216657271555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 216657271555 - 2³ = 216657271547 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1243974 + ... + 1407403.

It is an arithmetic number, because the mean of its divisors is an integer number (16584369390).

Almost surely, 2^216657271555 is an apocalyptic number.

216657271555 is a deficient number, since it is larger than the sum of its proper divisors (48692638685).

216657271555 is a wasteful number, since it uses less digits than its factorization.

216657271555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651718.

The product of its digits is 4410000, while the sum is 52.

The spelling of 216657271555 in words is "two hundred sixteen billion, six hundred fifty-seven million, two hundred seventy-one thousand, five hundred fifty-five".