16165666655658 has 96 divisors (see below), whose sum is σ = 38937828513600. Its totient is φ = 4969167113664.

The previous prime is 16165666655653. The next prime is 16165666655729. The reversal of 16165666655658 is 85655666656161.

It is a super-2 number, since 2×16165666655658² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16165666655651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8430216 + ... + 10168572.

It is an arithmetic number, because the mean of its divisors is an integer number (405602380350).

Almost surely, 2^{16165666655658} is an apocalyptic number.

16165666655658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16165666655658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19468914256800).

16165666655658 is an abundant number, since it is smaller than the sum of its proper divisors (22772161857942).

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

16165666655658 is a wasteful number, since it uses less digits than its factorization.

16165666655658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739413 (or 1739394 counting only the distinct ones).

The product of its digits is 1399680000, while the sum is 72.

The spelling of 16165666655658 in words is "sixteen trillion, one hundred sixty-five billion, six hundred sixty-six million, six hundred fifty-five thousand, six hundred fifty-eight".