66131262413 has 2 divisors, whose sum is σ = 66131262414. Its totient is φ = 66131262412.

The previous prime is 66131262409. The next prime is 66131262467. The reversal of 66131262413 is 31426213166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52396125604 + 13735136809 = 228902^2 + 117197^2 .

It is a cyclic number.

It is not a de Polignac number, because 66131262413 - 2² = 66131262409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66131262473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33065631206 + 33065631207.

It is an arithmetic number, because the mean of its divisors is an integer number (33065631207).

Almost surely, 2^66131262413 is an apocalyptic number.

It is an amenable number.

66131262413 is a deficient number, since it is larger than the sum of its proper divisors (1).

66131262413 is an equidigital number, since it uses as much as digits as its factorization.

66131262413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

Adding to 66131262413 its reverse (31426213166), we get a palindrome (97557475579).

The spelling of 66131262413 in words is "sixty-six billion, one hundred thirty-one million, two hundred sixty-two thousand, four hundred thirteen".