165554311331420 has 36 divisors (see below), whose sum is σ = 382143133516872. Its totient is φ = 60201567756000.

The previous prime is 165554311331417. The next prime is 165554311331459. The reversal of 165554311331420 is 24133113455561.

It is a super-2 number, since 2×165554311331420² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34205433806 + ... + 34205438645.

Almost surely, 2^{165554311331420} is an apocalyptic number.

165554311331420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165554311331420 is an abundant number, since it is smaller than the sum of its proper divisors (216588822185452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165554311331420 is a wasteful number, since it uses less digits than its factorization.

165554311331420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68410872482 (or 68410872469 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

Adding to 165554311331420 its reverse (24133113455561), we get a palindrome (189687424786981).

The spelling of 165554311331420 in words is "one hundred sixty-five trillion, five hundred fifty-four billion, three hundred eleven million, three hundred thirty-one thousand, four hundred twenty".