165554923901 has 2 divisors, whose sum is σ = 165554923902. Its totient is φ = 165554923900.

The previous prime is 165554923889. The next prime is 165554923907. The reversal of 165554923901 is 109329455561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160584532900 + 4970391001 = 400730^2 + 70501^2 .

It is a cyclic number.

It is not a de Polignac number, because 165554923901 - 2¹⁴ = 165554907517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165554923901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165554923907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82777461950 + 82777461951.

It is an arithmetic number, because the mean of its divisors is an integer number (82777461951).

Almost surely, 2^165554923901 is an apocalyptic number.

It is an amenable number.

165554923901 is a deficient number, since it is larger than the sum of its proper divisors (1).

165554923901 is an equidigital number, since it uses as much as digits as its factorization.

165554923901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The spelling of 165554923901 in words is "one hundred sixty-five billion, five hundred fifty-four million, nine hundred twenty-three thousand, nine hundred one".