16598676421 has 2 divisors, whose sum is σ = 16598676422. Its totient is φ = 16598676420.

The previous prime is 16598676403. The next prime is 16598676439. The reversal of 16598676421 is 12467689561.

It is a balanced prime because it is at equal distance from previous prime (16598676403) and next prime (16598676439).

It can be written as a sum of positive squares in only one way, i.e., 10002800196 + 6595876225 = 100014^2 + 81215^2 .

It is a cyclic number.

It is not a de Polignac number, because 16598676421 - 2⁹ = 16598675909 is a prime.

It is a super-2 number, since 2×16598676421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16598676401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8299338210 + 8299338211.

It is an arithmetic number, because the mean of its divisors is an integer number (8299338211).

Almost surely, 2^16598676421 is an apocalyptic number.

It is an amenable number.

16598676421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16598676421 is an equidigital number, since it uses as much as digits as its factorization.

16598676421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The spelling of 16598676421 in words is "sixteen billion, five hundred ninety-eight million, six hundred seventy-six thousand, four hundred twenty-one".