16025622721 has 2 divisors, whose sum is σ = 16025622722. Its totient is φ = 16025622720.

The previous prime is 16025622719. The next prime is 16025622779. The reversal of 16025622721 is 12722652061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16023762225 + 1860496 = 126585^2 + 1364^2 .

It is a cyclic number.

It is not a de Polignac number, because 16025622721 - 2¹ = 16025622719 is a prime.

Together with 16025622719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16025622791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8012811360 + 8012811361.

It is an arithmetic number, because the mean of its divisors is an integer number (8012811361).

Almost surely, 2^16025622721 is an apocalyptic number.

It is an amenable number.

16025622721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16025622721 is an equidigital number, since it uses as much as digits as its factorization.

16025622721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 16025622721 in words is "sixteen billion, twenty-five million, six hundred twenty-two thousand, seven hundred twenty-one".