216561102446 has 16 divisors (see below), whose sum is σ = 353760145200. Its totient is φ = 98828228928.

The previous prime is 216561102377. The next prime is 216561102449. The reversal of 216561102446 is 644201165612.

It is a happy number.

It is a super-4 number, since 4×216561102446⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216561102449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46791356 + ... + 46795983.

It is an arithmetic number, because the mean of its divisors is an integer number (22110009075).

Almost surely, 2^216561102446 is an apocalyptic number.

216561102446 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216561102446 is a deficient number, since it is larger than the sum of its proper divisors (137199042754).

216561102446 is a wasteful number, since it uses less digits than its factorization.

216561102446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93587443.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 216561102446 in words is "two hundred sixteen billion, five hundred sixty-one million, one hundred two thousand, four hundred forty-six".