165858073855 has 4 divisors (see below), whose sum is σ = 199029688632. Its totient is φ = 132686459080.

The previous prime is 165858073841. The next prime is 165858073861. The reversal of 165858073855 is 558370858561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558370858561 = 577 ⋅967713793.

It is not a de Polignac number, because 165858073855 - 2⁹ = 165858073343 is a prime.

It is a super-2 number, since 2×165858073855² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165858073793 and 165858073802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16585807381 + ... + 16585807390.

It is an arithmetic number, because the mean of its divisors is an integer number (49757422158).

Almost surely, 2^165858073855 is an apocalyptic number.

165858073855 is a deficient number, since it is larger than the sum of its proper divisors (33171614777).

165858073855 is an equidigital number, since it uses as much as digits as its factorization.

165858073855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33171614776.

The product of its (nonzero) digits is 40320000, while the sum is 61.

The spelling of 165858073855 in words is "one hundred sixty-five billion, eight hundred fifty-eight million, seventy-three thousand, eight hundred fifty-five".