15545121145 has 8 divisors (see below), whose sum is σ = 18909682056. Its totient is φ = 12265739136.

The previous prime is 15545121143. The next prime is 15545121247. The reversal of 15545121145 is 54112154551.

It can be written as a sum of positive squares in 4 ways, for example, as 5426974224 + 10118146921 = 73668^2 + 100589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15545121145 - 2¹ = 15545121143 is a prime.

It is a super-2 number, since 2×15545121145² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15545121145.

It is not an unprimeable number, because it can be changed into a prime (15545121143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21294322 + ... + 21295051.

It is an arithmetic number, because the mean of its divisors is an integer number (2363710257).

Almost surely, 2^15545121145 is an apocalyptic number.

It is an amenable number.

15545121145 is a deficient number, since it is larger than the sum of its proper divisors (3364560911).

15545121145 is an equidigital number, since it uses as much as digits as its factorization.

15545121145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42589451.

The product of its digits is 20000, while the sum is 34.

Adding to 15545121145 its reverse (54112154551), we get a palindrome (69657275696).

The spelling of 15545121145 in words is "fifteen billion, five hundred forty-five million, one hundred twenty-one thousand, one hundred forty-five".