161211112669 has 2 divisors, whose sum is σ = 161211112670. Its totient is φ = 161211112668.

The previous prime is 161211112583. The next prime is 161211112681. The reversal of 161211112669 is 966211112161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141263222500 + 19947890169 = 375850^2 + 141237^2 .

It is an emirp because it is prime and its reverse (966211112161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161211112669 - 2²³ = 161202724061 is a prime.

It is a super-2 number, since 2×161211112669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161211112369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80605556334 + 80605556335.

It is an arithmetic number, because the mean of its divisors is an integer number (80605556335).

Almost surely, 2^161211112669 is an apocalyptic number.

It is an amenable number.

161211112669 is a deficient number, since it is larger than the sum of its proper divisors (1).

161211112669 is an equidigital number, since it uses as much as digits as its factorization.

161211112669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 37.

The spelling of 161211112669 in words is "one hundred sixty-one billion, two hundred eleven million, one hundred twelve thousand, six hundred sixty-nine".