15445120181 has 2 divisors, whose sum is σ = 15445120182. Its totient is φ = 15445120180.

The previous prime is 15445120153. The next prime is 15445120183. The reversal of 15445120181 is 18102154451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14498327281 + 946792900 = 120409^2 + 30770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15445120181 is a prime.

It is a super-2 number, since 2×15445120181² (a number of 21 digits) contains 22 as substring.

Together with 15445120183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15445120183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7722560090 + 7722560091.

It is an arithmetic number, because the mean of its divisors is an integer number (7722560091).

Almost surely, 2^15445120181 is an apocalyptic number.

It is an amenable number.

15445120181 is a deficient number, since it is larger than the sum of its proper divisors (1).

15445120181 is an equidigital number, since it uses as much as digits as its factorization.

15445120181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 32.

The spelling of 15445120181 in words is "fifteen billion, four hundred forty-five million, one hundred twenty thousand, one hundred eighty-one".