216623256564220 has 48 divisors (see below), whose sum is σ = 496827484677216. Its totient is φ = 78682681088000.

The previous prime is 216623256564179. The next prime is 216623256564229. The reversal of 216623256564220 is 22465652326612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216623256564229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558632041 + ... + 559019680.

It is an arithmetic number, because the mean of its divisors is an integer number (10350572597442).

Almost surely, 2^{216623256564220} is an apocalyptic number.

216623256564220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216623256564220 is an abundant number, since it is smaller than the sum of its proper divisors (280204228112996).

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

216623256564220 is a wasteful number, since it uses less digits than its factorization.

216623256564220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117652622 (or 1117652620 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 52.

The spelling of 216623256564220 in words is "two hundred sixteen trillion, six hundred twenty-three billion, two hundred fifty-six million, five hundred sixty-four thousand, two hundred twenty".