16721552404 has 6 divisors (see below), whose sum is σ = 29262716714. Its totient is φ = 8360776200.

The previous prime is 16721552401. The next prime is 16721552423. The reversal of 16721552404 is 40425512761.

It can be written as a sum of positive squares in only one way, i.e., 13748031504 + 2973520900 = 117252^2 + 54530^2 .

It is a super-2 number, since 2×16721552404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721552401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2090194047 + ... + 2090194054.

Almost surely, 2^16721552404 is an apocalyptic number.

It is an amenable number.

16721552404 is a deficient number, since it is larger than the sum of its proper divisors (12541164310).

16721552404 is a wasteful number, since it uses less digits than its factorization.

16721552404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180388105 (or 4180388103 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 16721552404 in words is "sixteen billion, seven hundred twenty-one million, five hundred fifty-two thousand, four hundred four".