216454611660 has 48 divisors (see below), whose sum is σ = 692654758656. Its totient is φ = 49475339712.

The previous prime is 216454611649. The next prime is 216454611661. The reversal of 216454611660 is 66116454612.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (216454611661) 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, 257683642 + ... + 257684481.

It is an arithmetic number, because the mean of its divisors is an integer number (14430307472).

Almost surely, 2^216454611660 is an apocalyptic number.

216454611660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216454611660 is an abundant number, since it is smaller than the sum of its proper divisors (476200146996).

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

216454611660 is a wasteful number, since it uses less digits than its factorization.

216454611660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515368142 (or 515368140 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 216454611660 in words is "two hundred sixteen billion, four hundred fifty-four million, six hundred eleven thousand, six hundred sixty".