1611166165503 has 32 divisors (see below), whose sum is σ = 2335353292800. Its totient is φ = 984279859200.

The previous prime is 1611166165501. The next prime is 1611166165517. The reversal of 1611166165503 is 3055616611161.

It is a happy number.

It is not a de Polignac number, because 1611166165503 - 2¹ = 1611166165501 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 3473023 + ... + 3909503.

It is an arithmetic number, because the mean of its divisors is an integer number (72979790400).

Almost surely, 2^{1611166165503} is an apocalyptic number.

1611166165503 is a deficient number, since it is larger than the sum of its proper divisors (724187127297).

1611166165503 is a wasteful number, since it uses less digits than its factorization.

1611166165503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438623.

The product of its (nonzero) digits is 97200, while the sum is 42.

The spelling of 1611166165503 in words is "one trillion, six hundred eleven billion, one hundred sixty-six million, one hundred sixty-five thousand, five hundred three".