65146955581 has 2 divisors, whose sum is σ = 65146955582. Its totient is φ = 65146955580.

The previous prime is 65146955561. The next prime is 65146955591. The reversal of 65146955581 is 18555964156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64477905625 + 669049956 = 253925^2 + 25866^2 .

It is a cyclic number.

It is not a de Polignac number, because 65146955581 - 2¹³ = 65146947389 is a prime.

It is a super-2 number, since 2×65146955581² (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 (65146955561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32573477790 + 32573477791.

It is an arithmetic number, because the mean of its divisors is an integer number (32573477791).

Almost surely, 2^65146955581 is an apocalyptic number.

It is an amenable number.

65146955581 is a deficient number, since it is larger than the sum of its proper divisors (1).

65146955581 is an equidigital number, since it uses as much as digits as its factorization.

65146955581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480000, while the sum is 55.

The spelling of 65146955581 in words is "sixty-five billion, one hundred forty-six million, nine hundred fifty-five thousand, five hundred eighty-one".