16243771261 has 2 divisors, whose sum is σ = 16243771262. Its totient is φ = 16243771260.

The previous prime is 16243771217. The next prime is 16243771267. The reversal of 16243771261 is 16217734261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15762802500 + 480968761 = 125550^2 + 21931^2 .

It is a cyclic number.

It is not a de Polignac number, because 16243771261 - 2²¹ = 16241674109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16243771267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8121885630 + 8121885631.

It is an arithmetic number, because the mean of its divisors is an integer number (8121885631).

Almost surely, 2^16243771261 is an apocalyptic number.

It is an amenable number.

16243771261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16243771261 is an equidigital number, since it uses as much as digits as its factorization.

16243771261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The spelling of 16243771261 in words is "sixteen billion, two hundred forty-three million, seven hundred seventy-one thousand, two hundred sixty-one".