165554923889 has 2 divisors, whose sum is σ = 165554923890. Its totient is φ = 165554923888.

The previous prime is 165554923843. The next prime is 165554923901. The reversal of 165554923889 is 988329455561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103534002289 + 62020921600 = 321767^2 + 249040^2 .

It is a cyclic number.

It is not a de Polignac number, because 165554923889 - 2¹⁶ = 165554858353 is a prime.

It is a super-3 number, since 3×165554923889³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (165554943889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82777461944 + 82777461945.

It is an arithmetic number, because the mean of its divisors is an integer number (82777461945).

Almost surely, 2^165554923889 is an apocalyptic number.

It is an amenable number.

165554923889 is a deficient number, since it is larger than the sum of its proper divisors (1).

165554923889 is an equidigital number, since it uses as much as digits as its factorization.

165554923889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312000, while the sum is 65.

The spelling of 165554923889 in words is "one hundred sixty-five billion, five hundred fifty-four million, nine hundred twenty-three thousand, eight hundred eighty-nine".