216640330204540 has 96 divisors (see below), whose sum is σ = 504259153187328. Its totient is φ = 77525220000000.

The previous prime is 216640330204447. The next prime is 216640330204547. The reversal of 216640330204540 is 45402033046612.

It is a super-2 number, since 2×216640330204540² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216640330204493 and 216640330204502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216640330204547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26919211 + ... + 34028290.

It is an arithmetic number, because the mean of its divisors is an integer number (5252699512368).

Almost surely, 2^{216640330204540} is an apocalyptic number.

216640330204540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216640330204540 is an abundant number, since it is smaller than the sum of its proper divisors (287618822982788).

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

216640330204540 is a wasteful number, since it uses less digits than its factorization.

216640330204540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60947779 (or 60947777 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 40.

The spelling of 216640330204540 in words is "two hundred sixteen trillion, six hundred forty billion, three hundred thirty million, two hundred four thousand, five hundred forty".