16195769581 has 2 divisors, whose sum is σ = 16195769582. Its totient is φ = 16195769580.

The previous prime is 16195769533. The next prime is 16195769587. The reversal of 16195769581 is 18596759161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8572908100 + 7622861481 = 92590^2 + 87309^2 .

It is a cyclic number.

It is not a de Polignac number, because 16195769581 - 2¹³ = 16195761389 is a prime.

It is a super-2 number, since 2×16195769581² (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 (16195769587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8097884790 + 8097884791.

It is an arithmetic number, because the mean of its divisors is an integer number (8097884791).

Almost surely, 2^16195769581 is an apocalyptic number.

It is an amenable number.

16195769581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16195769581 is an equidigital number, since it uses as much as digits as its factorization.

16195769581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 58.

The spelling of 16195769581 in words is "sixteen billion, one hundred ninety-five million, seven hundred sixty-nine thousand, five hundred eighty-one".