15541123225 has 6 divisors (see below), whose sum is σ = 19270992830. Its totient is φ = 12432898560.

The previous prime is 15541123219. The next prime is 15541123277. The reversal of 15541123225 is 52232114551.

It can be written as a sum of positive squares in 3 ways, for example, as 912704521 + 14628418704 = 30211^2 + 120948^2 .

It is not a de Polignac number, because 15541123225 - 2⁵ = 15541123193 is a prime.

It is a super-2 number, since 2×15541123225² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 310822440 + ... + 310822489.

Almost surely, 2^15541123225 is an apocalyptic number.

It is an amenable number.

15541123225 is a deficient number, since it is larger than the sum of its proper divisors (3729869605).

15541123225 is an equidigital number, since it uses as much as digits as its factorization.

15541123225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621644939 (or 621644934 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

Adding to 15541123225 its reverse (52232114551), we get a palindrome (67773237776).

The spelling of 15541123225 in words is "fifteen billion, five hundred forty-one million, one hundred twenty-three thousand, two hundred twenty-five".