65672877581 has 2 divisors, whose sum is σ = 65672877582. Its totient is φ = 65672877580.

The previous prime is 65672877563. The next prime is 65672877583. The reversal of 65672877581 is 18577827656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65668675081 + 4202500 = 256259^2 + 2050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65672877581 is a prime.

It is a super-2 number, since 2×65672877581² (a number of 22 digits) contains 22 as substring.

Together with 65672877583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65672877583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32836438790 + 32836438791.

It is an arithmetic number, because the mean of its divisors is an integer number (32836438791).

Almost surely, 2^65672877581 is an apocalyptic number.

It is an amenable number.

65672877581 is a deficient number, since it is larger than the sum of its proper divisors (1).

65672877581 is an equidigital number, since it uses as much as digits as its factorization.

65672877581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39513600, while the sum is 62.

The spelling of 65672877581 in words is "sixty-five billion, six hundred seventy-two million, eight hundred seventy-seven thousand, five hundred eighty-one".