12545442105 has 32 divisors (see below), whose sum is σ = 22968748800. Its totient is φ = 5727931392.

The previous prime is 12545442101. The next prime is 12545442121. The reversal of 12545442105 is 50124454521.

It is a happy number.

It is not a de Polignac number, because 12545442105 - 2² = 12545442101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12545442101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11101 + ... + 158789.

It is an arithmetic number, because the mean of its divisors is an integer number (717773400).

Almost surely, 2^12545442105 is an apocalyptic number.

12545442105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12545442105 is a deficient number, since it is larger than the sum of its proper divisors (10423306695).

12545442105 is a wasteful number, since it uses less digits than its factorization.

12545442105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148513.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 12545442105 its reverse (50124454521), we get a palindrome (62669896626).

The spelling of 12545442105 in words is "twelve billion, five hundred forty-five million, four hundred forty-two thousand, one hundred five".