161111707 has 4 divisors (see below), whose sum is σ = 161137600. Its totient is φ = 161085816.

The previous prime is 161111689. The next prime is 161111749. The reversal of 161111707 is 707111161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 707111161 = 8839 ⋅79999.

It is a cyclic number.

It is not a de Polignac number, because 161111707 - 2¹¹ = 161109659 is a prime.

It is a super-3 number, since 3×161111707³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161111777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2653 + ... + 18145.

It is an arithmetic number, because the mean of its divisors is an integer number (40284400).

Almost surely, 2^161111707 is an apocalyptic number.

161111707 is a deficient number, since it is larger than the sum of its proper divisors (25893).

161111707 is a wasteful number, since it uses less digits than its factorization.

161111707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25892.

The product of its (nonzero) digits is 294, while the sum is 25.

The square root of 161111707 is about 12692.9786496315. The cubic root of 161111707 is about 544.1379711948.

Adding to 161111707 its reverse (707111161), we get a palindrome (868222868).

The spelling of 161111707 in words is "one hundred sixty-one million, one hundred eleven thousand, seven hundred seven".