216257568720 has 40 divisors (see below), whose sum is σ = 670398463776. Its totient is φ = 57668684928.

The previous prime is 216257568677. The next prime is 216257568767. The reversal of 216257568720 is 27865752612.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450536362 + ... + 450536841.

Almost surely, 2^216257568720 is an apocalyptic number.

216257568720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216257568720 is an abundant number, since it is smaller than the sum of its proper divisors (454140895056).

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

216257568720 is a wasteful number, since it uses less digits than its factorization.

216257568720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901073219 (or 901073213 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 216257568720 in words is "two hundred sixteen billion, two hundred fifty-seven million, five hundred sixty-eight thousand, seven hundred twenty".