165051225213561 has 96 divisors (see below), whose sum is σ = 251910020089728. Its totient is φ = 107970374615040.

The previous prime is 165051225213557. The next prime is 165051225213587. The reversal of 165051225213561 is 165312522150561.

165051225213561 is a `hidden beast` number, since 1 + 6 + 5 + 0 + 5 + 1 + 22 + 52 + 13 + 561 = 666.

It is not a de Polignac number, because 165051225213561 - 2² = 165051225213557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165051225212561) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11741561245 + ... + 11741575301.

It is an arithmetic number, because the mean of its divisors is an integer number (2624062709268).

Almost surely, 2^{165051225213561} is an apocalyptic number.

It is an amenable number.

165051225213561 is a deficient number, since it is larger than the sum of its proper divisors (86858794876167).

165051225213561 is a wasteful number, since it uses less digits than its factorization.

165051225213561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17493 (or 17481 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 165051225213561 in words is "one hundred sixty-five trillion, fifty-one billion, two hundred twenty-five million, two hundred thirteen thousand, five hundred sixty-one".