12545521554 has 8 divisors (see below), whose sum is σ = 25091043120. Its totient is φ = 4181840516.

The previous prime is 12545521529. The next prime is 12545521567. The reversal of 12545521554 is 45512554521.

It is a happy number.

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

12545521554 is an admirable number.

It is a super-2 number, since 2×12545521554² (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 3 ways as a sum of consecutive naturals, for example, 1045460124 + ... + 1045460135.

It is an arithmetic number, because the mean of its divisors is an integer number (3136380390).

Almost surely, 2^12545521554 is an apocalyptic number.

12545521554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12545521554 is a wasteful number, since it uses less digits than its factorization.

12545521554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090920264.

The product of its digits is 200000, while the sum is 39.

The spelling of 12545521554 in words is "twelve billion, five hundred forty-five million, five hundred twenty-one thousand, five hundred fifty-four".