65143541581 has 2 divisors, whose sum is σ = 65143541582. Its totient is φ = 65143541580.

The previous prime is 65143541563. The next prime is 65143541611. The reversal of 65143541581 is 18514534156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39455465956 + 25688075625 = 198634^2 + 160275^2 .

It is a cyclic number.

It is not a de Polignac number, because 65143541581 - 2⁵ = 65143541549 is a prime.

It is a super-2 number, since 2×65143541581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65143541521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32571770790 + 32571770791.

It is an arithmetic number, because the mean of its divisors is an integer number (32571770791).

Almost surely, 2^65143541581 is an apocalyptic number.

It is an amenable number.

65143541581 is a deficient number, since it is larger than the sum of its proper divisors (1).

65143541581 is an equidigital number, since it uses as much as digits as its factorization.

65143541581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 43.

The spelling of 65143541581 in words is "sixty-five billion, one hundred forty-three million, five hundred forty-one thousand, five hundred eighty-one".