216662351555 has 16 divisors (see below), whose sum is σ = 281612903040. Its totient is φ = 159071968128.

The previous prime is 216662351489. The next prime is 216662351579. The reversal of 216662351555 is 555153266612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216662351555 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, 9622475 + ... + 9644964.

It is an arithmetic number, because the mean of its divisors is an integer number (17600806440).

Almost surely, 2^216662351555 is an apocalyptic number.

216662351555 is a deficient number, since it is larger than the sum of its proper divisors (64950551485).

216662351555 is a wasteful number, since it uses less digits than its factorization.

216662351555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19267630.

The product of its digits is 1620000, while the sum is 47.

The spelling of 216662351555 in words is "two hundred sixteen billion, six hundred sixty-two million, three hundred fifty-one thousand, five hundred fifty-five".