11661192169 has 9 divisors (see below), whose sum is σ = 12818979831. Its totient is φ = 10600003920.

The previous prime is 11661192121. The next prime is 11661192173. The reversal of 11661192169 is 96129116611.

The square root of 11661192169 is 107987.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11585293225 + 75898944 = 107635^2 + 8712^2 .

It is not a de Polignac number, because 11661192169 - 2⁹ = 11661191657 is a prime.

It is a super-2 number, since 2×11661192169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661192199) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1182949 + ... + 1192765.

Almost surely, 2^11661192169 is an apocalyptic number.

11661192169 is the 107987-th square number.

11661192169 is the 53994-th centered octagonal number.

It is an amenable number.

11661192169 is a deficient number, since it is larger than the sum of its proper divisors (1157787662).

11661192169 is an frugal number, since it uses more digits than its factorization.

11661192169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19656 (or 9828 counting only the distinct ones).

The product of its digits is 34992, while the sum is 43.

The spelling of 11661192169 in words is "eleven billion, six hundred sixty-one million, one hundred ninety-two thousand, one hundred sixty-nine".