165543502451 has 2 divisors, whose sum is σ = 165543502452. Its totient is φ = 165543502450.

The previous prime is 165543502393. The next prime is 165543502469. The reversal of 165543502451 is 154205345561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165543502451 - 2¹⁸ = 165543240307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165543502399 and 165543502408.

It is not a weakly prime, because it can be changed into another prime (165543502471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82771751225 + 82771751226.

It is an arithmetic number, because the mean of its divisors is an integer number (82771751226).

Almost surely, 2^165543502451 is an apocalyptic number.

165543502451 is a deficient number, since it is larger than the sum of its proper divisors (1).

165543502451 is an equidigital number, since it uses as much as digits as its factorization.

165543502451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 165543502451 in words is "one hundred sixty-five billion, five hundred forty-three million, five hundred two thousand, four hundred fifty-one".