16421677277 has 2 divisors, whose sum is σ = 16421677278. Its totient is φ = 16421677276.

The previous prime is 16421677273. The next prime is 16421677297. The reversal of 16421677277 is 77277612461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15897679396 + 523997881 = 126086^2 + 22891^2 .

It is a cyclic number.

It is not a de Polignac number, because 16421677277 - 2² = 16421677273 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16421677271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210838638 + 8210838639.

It is an arithmetic number, because the mean of its divisors is an integer number (8210838639).

Almost surely, 2^16421677277 is an apocalyptic number.

It is an amenable number.

16421677277 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421677277 is an equidigital number, since it uses as much as digits as its factorization.

16421677277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382976, while the sum is 50.

The spelling of 16421677277 in words is "sixteen billion, four hundred twenty-one million, six hundred seventy-seven thousand, two hundred seventy-seven".