16556390548 has 6 divisors (see below), whose sum is σ = 28973683466. Its totient is φ = 8278195272.

The previous prime is 16556390509. The next prime is 16556390573. The reversal of 16556390548 is 84509365561.

It can be written as a sum of positive squares in only one way, i.e., 16532302084 + 24088464 = 128578^2 + 4908^2 .

It is a super-2 number, since 2×16556390548² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16556390495 and 16556390504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069548815 + ... + 2069548822.

Almost surely, 2^16556390548 is an apocalyptic number.

It is an amenable number.

16556390548 is a deficient number, since it is larger than the sum of its proper divisors (12417292918).

16556390548 is a wasteful number, since it uses less digits than its factorization.

16556390548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139097641 (or 4139097639 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 16556390548 in words is "sixteen billion, five hundred fifty-six million, three hundred ninety thousand, five hundred forty-eight".