11455820161 has 2 divisors, whose sum is σ = 11455820162. Its totient is φ = 11455820160.

The previous prime is 11455820153. The next prime is 11455820213. The reversal of 11455820161 is 16102855411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8291195136 + 3164625025 = 91056^2 + 56255^2 .

It is a cyclic number.

It is not a de Polignac number, because 11455820161 - 2³ = 11455820153 is a prime.

It is a super-2 number, since 2×11455820161² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11455820111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5727910080 + 5727910081.

It is an arithmetic number, because the mean of its divisors is an integer number (5727910081).

Almost surely, 2^11455820161 is an apocalyptic number.

It is an amenable number.

11455820161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11455820161 is an equidigital number, since it uses as much as digits as its factorization.

11455820161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 34.

The spelling of 11455820161 in words is "eleven billion, four hundred fifty-five million, eight hundred twenty thousand, one hundred sixty-one".