51566967181 has 2 divisors, whose sum is σ = 51566967182. Its totient is φ = 51566967180.

The previous prime is 51566967169. The next prime is 51566967217. The reversal of 51566967181 is 18176966515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31582621225 + 19984345956 = 177715^2 + 141366^2 .

It is a cyclic number.

It is not a de Polignac number, because 51566967181 - 2²¹ = 51564870029 is a prime.

It is a super-2 number, since 2×51566967181² (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 (51566967121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25783483590 + 25783483591.

It is an arithmetic number, because the mean of its divisors is an integer number (25783483591).

Almost surely, 2^51566967181 is an apocalyptic number.

It is an amenable number.

51566967181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51566967181 is an equidigital number, since it uses as much as digits as its factorization.

51566967181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 55.

The spelling of 51566967181 in words is "fifty-one billion, five hundred sixty-six million, nine hundred sixty-seven thousand, one hundred eighty-one".