16465221504 has 192 divisors, whose sum is σ = 49286094000. Its totient is φ = 5271920640.

The previous prime is 16465221481. The next prime is 16465221517. The reversal of 16465221504 is 40512256461.

16465221504 is a `hidden beast` number, since 1 + 646 + 5 + 2 + 2 + 1 + 5 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×16465221504² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3018972 + ... + 3024420.

Almost surely, 2^16465221504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16465221504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24643047000).

16465221504 is an abundant number, since it is smaller than the sum of its proper divisors (32820872496).

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

16465221504 is a wasteful number, since it uses less digits than its factorization.

16465221504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573 (or 5558 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 16465221504 its reverse (40512256461), we get a palindrome (56977477965).

The spelling of 16465221504 in words is "sixteen billion, four hundred sixty-five million, two hundred twenty-one thousand, five hundred four".