16405487522 has 30 divisors (see below), whose sum is σ = 25771398609. Its totient is φ = 7832407120.

The previous prime is 16405487503. The next prime is 16405487537. The reversal of 16405487522 is 22578450461.

It can be written as a sum of positive squares in 2 ways, for example, as 11716114081 + 4689373441 = 108241^2 + 68479^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=90569.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 349052903 + ... + 349052949.

Almost surely, 2^16405487522 is an apocalyptic number.

16405487522 is a deficient number, since it is larger than the sum of its proper divisors (9365911087).

16405487522 is an frugal number, since it uses more digits than its factorization.

16405487522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 44.

The spelling of 16405487522 in words is "sixteen billion, four hundred five million, four hundred eighty-seven thousand, five hundred twenty-two".