165072627781 has 2 divisors, whose sum is σ = 165072627782. Its totient is φ = 165072627780.

The previous prime is 165072627767. The next prime is 165072627823. The reversal of 165072627781 is 187726270561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90739512900 + 74333114881 = 301230^2 + 272641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165072627781 is a prime.

It is a super-2 number, since 2×165072627781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165072627761) 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, 82536313890 + 82536313891.

It is an arithmetic number, because the mean of its divisors is an integer number (82536313891).

Almost surely, 2^165072627781 is an apocalyptic number.

It is an amenable number.

165072627781 is a deficient number, since it is larger than the sum of its proper divisors (1).

165072627781 is an equidigital number, since it uses as much as digits as its factorization.

165072627781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 165072627781 in words is "one hundred sixty-five billion, seventy-two million, six hundred twenty-seven thousand, seven hundred eighty-one".