165563121727547 has 2 divisors, whose sum is σ = 165563121727548. Its totient is φ = 165563121727546.

The previous prime is 165563121727519. The next prime is 165563121727637. The reversal of 165563121727547 is 745727121365561.

165563121727547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165563121727547 - 2²² = 165563117533243 is a prime.

It is a super-2 number, since 2×165563121727547² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165563121727547.

It is not a weakly prime, because it can be changed into another prime (165563121727147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82781560863773 + 82781560863774.

It is an arithmetic number, because the mean of its divisors is an integer number (82781560863774).

Almost surely, 2^{165563121727547} is an apocalyptic number.

165563121727547 is a deficient number, since it is larger than the sum of its proper divisors (1).

165563121727547 is an equidigital number, since it uses as much as digits as its factorization.

165563121727547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088000, while the sum is 62.

The spelling of 165563121727547 in words is "one hundred sixty-five trillion, five hundred sixty-three billion, one hundred twenty-one million, seven hundred twenty-seven thousand, five hundred forty-seven".