65555942381 has 2 divisors, whose sum is σ = 65555942382. Its totient is φ = 65555942380.

The previous prime is 65555942377. The next prime is 65555942411. The reversal of 65555942381 is 18324955556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61645441225 + 3910501156 = 248285^2 + 62534^2 .

It is a cyclic number.

It is not a de Polignac number, because 65555942381 - 2² = 65555942377 is a prime.

It is a super-2 number, since 2×65555942381² (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 (65555242381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32777971190 + 32777971191.

It is an arithmetic number, because the mean of its divisors is an integer number (32777971191).

Almost surely, 2^65555942381 is an apocalyptic number.

It is an amenable number.

65555942381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65555942381 is an equidigital number, since it uses as much as digits as its factorization.

65555942381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480000, while the sum is 53.

The spelling of 65555942381 in words is "sixty-five billion, five hundred fifty-five million, nine hundred forty-two thousand, three hundred eighty-one".