216440654443606 has 4 divisors (see below), whose sum is σ = 324660981665412. Its totient is φ = 108220327221802.

The previous prime is 216440654443589. The next prime is 216440654443661. The reversal of 216440654443606 is 606344456044612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×216440654443606³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54110163610900 + ... + 54110163610903.

It is an arithmetic number, because the mean of its divisors is an integer number (81165245416353).

Almost surely, 2^{216440654443606} is an apocalyptic number.

216440654443606 is a deficient number, since it is larger than the sum of its proper divisors (108220327221806).

216440654443606 is a wasteful number, since it uses less digits than its factorization.

216440654443606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108220327221805.

The product of its (nonzero) digits is 39813120, while the sum is 55.

The spelling of 216440654443606 in words is "two hundred sixteen trillion, four hundred forty billion, six hundred fifty-four million, four hundred forty-three thousand, six hundred six".