1611166165500 has 192 divisors, whose sum is σ = 4823236768896. Its totient is φ = 417623040000.

The previous prime is 1611166165487. The next prime is 1611166165501. The reversal of 1611166165500 is 55616611161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611166165501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58871820 + ... + 58899180.

It is an arithmetic number, because the mean of its divisors is an integer number (25121024838).

Almost surely, 2^{1611166165500} is an apocalyptic number.

1611166165500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1611166165500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2411618384448).

1611166165500 is an abundant number, since it is smaller than the sum of its proper divisors (3212070603396).

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

1611166165500 is a wasteful number, since it uses less digits than its factorization.

1611166165500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28481 (or 28469 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

It can be divided in two parts, 16111661 and 65500, that added together give a palindrome (16177161).

The spelling of 1611166165500 in words is "one trillion, six hundred eleven billion, one hundred sixty-six million, one hundred sixty-five thousand, five hundred".