216722660540 has 12 divisors (see below), whose sum is σ = 455117587176. Its totient is φ = 86689064208.

The previous prime is 216722660527. The next prime is 216722660587. The reversal of 216722660540 is 45066227612.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5418066494 + ... + 5418066533.

It is an arithmetic number, because the mean of its divisors is an integer number (37926465598).

Almost surely, 2^216722660540 is an apocalyptic number.

216722660540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216722660540 is an abundant number, since it is smaller than the sum of its proper divisors (238394926636).

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

216722660540 is a wasteful number, since it uses less digits than its factorization.

216722660540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10836133036 (or 10836133034 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 216722660540 in words is "two hundred sixteen billion, seven hundred twenty-two million, six hundred sixty thousand, five hundred forty".