161605501111406 has 32 divisors (see below), whose sum is σ = 278365099461120. Its totient is φ = 69590496427200.

The previous prime is 161605501111363. The next prime is 161605501111423. The reversal of 161605501111406 is 604111105506161.

It is a super-2 number, since 2×161605501111406² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161605501111406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81232346 + ... + 83197986.

It is an arithmetic number, because the mean of its divisors is an integer number (8698909358160).

Almost surely, 2^{161605501111406} is an apocalyptic number.

161605501111406 is a deficient number, since it is larger than the sum of its proper divisors (116759598349714).

161605501111406 is a wasteful number, since it uses less digits than its factorization.

161605501111406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162360.

The product of its (nonzero) digits is 21600, while the sum is 38.

Adding to 161605501111406 its reverse (604111105506161), we get a palindrome (765716606617567).

The spelling of 161605501111406 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred one million, one hundred eleven thousand, four hundred six".