165045125451557 has 6 divisors (see below), whose sum is σ = 178717502708082. Its totient is φ = 152349346570512.

The previous prime is 165045125451553. The next prime is 165045125451637. The reversal of 165045125451557 is 755154521540561.

It can be written as a sum of positive squares in 3 ways, for example, as 12570811345156 + 152474314106401 = 3545534^2 + 12348049^2 .

It is not a de Polignac number, because 165045125451557 - 2² = 165045125451553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165045125451553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 488299187558 + ... + 488299187895.

It is an arithmetic number, because the mean of its divisors is an integer number (29786250451347).

Almost surely, 2^{165045125451557} is an apocalyptic number.

It is an amenable number.

165045125451557 is a deficient number, since it is larger than the sum of its proper divisors (13672377256525).

165045125451557 is an equidigital number, since it uses as much as digits as its factorization.

165045125451557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976598375479 (or 976598375466 counting only the distinct ones).

The product of its (nonzero) digits is 21000000, while the sum is 56.

The spelling of 165045125451557 in words is "one hundred sixty-five trillion, forty-five billion, one hundred twenty-five million, four hundred fifty-one thousand, five hundred fifty-seven".