165045641461551 has 20 divisors (see below), whose sum is σ = 246933098502552. Its totient is φ = 109859307190128.

The previous prime is 165045641461543. The next prime is 165045641461579. The reversal of 165045641461551 is 155164146540561.

165045641461551 is a `hidden beast` number, since 1 + 6 + 5 + 0 + 4 + 5 + 6 + 4 + 14 + 615 + 5 + 1 = 666.

It is not a de Polignac number, because 165045641461551 - 2³ = 165045641461543 is a prime.

It is a super-2 number, since 2×165045641461551² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165045641461951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1584396216 + ... + 1584500381.

Almost surely, 2^{165045641461551} is an apocalyptic number.

165045641461551 is a deficient number, since it is larger than the sum of its proper divisors (81887457041001).

165045641461551 is an equidigital number, since it uses as much as digits as its factorization.

165045641461551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3168897252 (or 3168897243 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 54.

The spelling of 165045641461551 in words is "one hundred sixty-five trillion, forty-five billion, six hundred forty-one million, four hundred sixty-one thousand, five hundred fifty-one".