16126664021 has 8 divisors (see below), whose sum is σ = 17370817464. Its totient is φ = 14883030720.

The previous prime is 16126663997. The next prime is 16126664063. The reversal of 16126664021 is 12046662161.

It can be written as a sum of positive squares in 4 ways, for example, as 217887121 + 15908776900 = 14761^2 + 126130^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16126664021 - 2¹⁰ = 16126662997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16126667021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64406 + ... + 190791.

It is an arithmetic number, because the mean of its divisors is an integer number (2171352183).

Almost surely, 2^16126664021 is an apocalyptic number.

It is an amenable number.

16126664021 is a deficient number, since it is larger than the sum of its proper divisors (1244153443).

16126664021 is a wasteful number, since it uses less digits than its factorization.

16126664021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260071.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 16126664021 in words is "sixteen billion, one hundred twenty-six million, six hundred sixty-four thousand, twenty-one".