16337955721 has 2 divisors, whose sum is σ = 16337955722. Its totient is φ = 16337955720.

The previous prime is 16337955709. The next prime is 16337955731. The reversal of 16337955721 is 12755973361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14678534025 + 1659421696 = 121155^2 + 40736^2 .

It is a cyclic number.

It is not a de Polignac number, because 16337955721 - 2³³ = 7748021129 is a prime.

It is not a weakly prime, because it can be changed into another prime (16337955731) by changing a digit.

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, 8168977860 + 8168977861.

It is an arithmetic number, because the mean of its divisors is an integer number (8168977861).

Almost surely, 2^16337955721 is an apocalyptic number.

It is an amenable number.

16337955721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16337955721 is an equidigital number, since it uses as much as digits as its factorization.

16337955721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1190700, while the sum is 49.

The spelling of 16337955721 in words is "sixteen billion, three hundred thirty-seven million, nine hundred fifty-five thousand, seven hundred twenty-one".