165551312133545 has 16 divisors (see below), whose sum is σ = 213975892795392. Its totient is φ = 122234614564800.

The previous prime is 165551312133539. The next prime is 165551312133551. The reversal of 165551312133545 is 545331213155561.

It is an interprime number because it is at equal distance from previous prime (165551312133539) and next prime (165551312133551).

It is a de Polignac number, because none of the positive numbers 2^k-165551312133545 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165551312133493 and 165551312133502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193967657 + ... + 194819286.

It is an arithmetic number, because the mean of its divisors is an integer number (13373493299712).

Almost surely, 2^{165551312133545} is an apocalyptic number.

It is an amenable number.

165551312133545 is a deficient number, since it is larger than the sum of its proper divisors (48424580661847).

165551312133545 is a wasteful number, since it uses less digits than its factorization.

165551312133545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388793512.

The product of its digits is 4050000, while the sum is 50.

The spelling of 165551312133545 in words is "one hundred sixty-five trillion, five hundred fifty-one billion, three hundred twelve million, one hundred thirty-three thousand, five hundred forty-five".