65645556131 has 2 divisors, whose sum is σ = 65645556132. Its totient is φ = 65645556130.

The previous prime is 65645556107. The next prime is 65645556139. The reversal of 65645556131 is 13165554656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65645556131 is a prime.

It is a super-2 number, since 2×65645556131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65645556139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32822778065 + 32822778066.

It is an arithmetic number, because the mean of its divisors is an integer number (32822778066).

Almost surely, 2^65645556131 is an apocalyptic number.

65645556131 is a deficient number, since it is larger than the sum of its proper divisors (1).

65645556131 is an equidigital number, since it uses as much as digits as its factorization.

65645556131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620000, while the sum is 47.

The spelling of 65645556131 in words is "sixty-five billion, six hundred forty-five million, five hundred fifty-six thousand, one hundred thirty-one".