16277724781 has 2 divisors, whose sum is σ = 16277724782. Its totient is φ = 16277724780.

The previous prime is 16277724769. The next prime is 16277724803. The reversal of 16277724781 is 18742777261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16196634756 + 81090025 = 127266^2 + 9005^2 .

It is a cyclic number.

It is not a de Polignac number, because 16277724781 - 2⁷ = 16277724653 is a prime.

It is a super-2 number, since 2×16277724781² (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 (16277724721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8138862390 + 8138862391.

It is an arithmetic number, because the mean of its divisors is an integer number (8138862391).

Almost surely, 2^16277724781 is an apocalyptic number.

It is an amenable number.

16277724781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16277724781 is an equidigital number, since it uses as much as digits as its factorization.

16277724781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1843968, while the sum is 52.

The spelling of 16277724781 in words is "sixteen billion, two hundred seventy-seven million, seven hundred twenty-four thousand, seven hundred eighty-one".