16277343781 has 2 divisors, whose sum is σ = 16277343782. Its totient is φ = 16277343780.

The previous prime is 16277343763. The next prime is 16277343811. The reversal of 16277343781 is 18734377261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8823784225 + 7453559556 = 93935^2 + 86334^2 .

It is a cyclic number.

It is not a de Polignac number, because 16277343781 - 2²³ = 16268955173 is a prime.

It is a super-2 number, since 2×16277343781² (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 (16277343721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8138671890 + 8138671891.

It is an arithmetic number, because the mean of its divisors is an integer number (8138671891).

Almost surely, 2^16277343781 is an apocalyptic number.

It is an amenable number.

16277343781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16277343781 is an equidigital number, since it uses as much as digits as its factorization.

16277343781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 49.

The spelling of 16277343781 in words is "sixteen billion, two hundred seventy-seven million, three hundred forty-three thousand, seven hundred eighty-one".