19652195581 has 2 divisors, whose sum is σ = 19652195582. Its totient is φ = 19652195580.

The previous prime is 19652195543. The next prime is 19652195597. The reversal of 19652195581 is 18559125691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16426523556 + 3225672025 = 128166^2 + 56795^2 .

It is a cyclic number.

It is not a de Polignac number, because 19652195581 - 2²⁵ = 19618641149 is a prime.

It is a super-2 number, since 2×19652195581² (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 (19652195531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9826097790 + 9826097791.

It is an arithmetic number, because the mean of its divisors is an integer number (9826097791).

Almost surely, 2^19652195581 is an apocalyptic number.

It is an amenable number.

19652195581 is a deficient number, since it is larger than the sum of its proper divisors (1).

19652195581 is an equidigital number, since it uses as much as digits as its factorization.

19652195581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 52.

The spelling of 19652195581 in words is "nineteen billion, six hundred fifty-two million, one hundred ninety-five thousand, five hundred eighty-one".