216646355554 has 8 divisors (see below), whose sum is σ = 342073193040. Its totient is φ = 102621957876.

The previous prime is 216646355509. The next prime is 216646355557. The reversal of 216646355554 is 455553646612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (216646355557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2850609904 + ... + 2850609979.

It is an arithmetic number, because the mean of its divisors is an integer number (42759149130).

Almost surely, 2^216646355554 is an apocalyptic number.

216646355554 is a deficient number, since it is larger than the sum of its proper divisors (125426837486).

216646355554 is a wasteful number, since it uses less digits than its factorization.

216646355554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5701219904.

The product of its digits is 12960000, while the sum is 52.

The spelling of 216646355554 in words is "two hundred sixteen billion, six hundred forty-six million, three hundred fifty-five thousand, five hundred fifty-four".