216401653356 has 48 divisors (see below), whose sum is σ = 578724652800. Its totient is φ = 61651874880.

The previous prime is 216401653337. The next prime is 216401653367. The reversal of 216401653356 is 653356104612.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 3661530 + ... + 3720161.

It is an arithmetic number, because the mean of its divisors is an integer number (12056763600).

Almost surely, 2^216401653356 is an apocalyptic number.

It is an amenable number.

216401653356 is an abundant number, since it is smaller than the sum of its proper divisors (362322999444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216401653356 is a wasteful number, since it uses less digits than its factorization.

216401653356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7382054 (or 7382052 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

Adding to 216401653356 its reverse (653356104612), we get a palindrome (869757757968).

The spelling of 216401653356 in words is "two hundred sixteen billion, four hundred one million, six hundred fifty-three thousand, three hundred fifty-six".