12451557537 has 36 divisors (see below), whose sum is σ = 19723080780. Its totient is φ = 7543259136.

The previous prime is 12451557529. The next prime is 12451557551. The reversal of 12451557537 is 73575515421.

12451557537 is a `hidden beast` number, since 1 + 2 + 45 + 1 + 5 + 575 + 37 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 351337536 + 12100220001 = 18744^2 + 110001^2 .

It is not a de Polignac number, because 12451557537 - 2³ = 12451557529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12451557492 and 12451557501.

It is not an unprimeable number, because it can be changed into a prime (12451557577) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 80289 + ... + 177057.

It is an arithmetic number, because the mean of its divisors is an integer number (547863355).

Almost surely, 2^12451557537 is an apocalyptic number.

12451557537 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12451557537 is a deficient number, since it is larger than the sum of its proper divisors (7271523243).

12451557537 is a wasteful number, since it uses less digits than its factorization.

12451557537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96850 (or 96818 counting only the distinct ones).

The product of its digits is 735000, while the sum is 45.

The spelling of 12451557537 in words is "twelve billion, four hundred fifty-one million, five hundred fifty-seven thousand, five hundred thirty-seven".