16487132621 has 2 divisors, whose sum is σ = 16487132622. Its totient is φ = 16487132620.

The previous prime is 16487132617. The next prime is 16487132663. The reversal of 16487132621 is 12623178461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15860631721 + 626500900 = 125939^2 + 25030^2 .

It is an emirp because it is prime and its reverse (12623178461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16487132621 - 2² = 16487132617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16487132611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8243566310 + 8243566311.

It is an arithmetic number, because the mean of its divisors is an integer number (8243566311).

Almost surely, 2^16487132621 is an apocalyptic number.

It is an amenable number.

16487132621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16487132621 is an equidigital number, since it uses as much as digits as its factorization.

16487132621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The spelling of 16487132621 in words is "sixteen billion, four hundred eighty-seven million, one hundred thirty-two thousand, six hundred twenty-one".