12551661507 has 16 divisors (see below), whose sum is σ = 20865100032. Its totient is φ = 6520343520.

The previous prime is 12551661487. The next prime is 12551661533. The reversal of 12551661507 is 70516615521.

It is a happy number.

12551661507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12551661507 - 2⁸ = 12551661251 is a prime.

It is a super-2 number, since 2×12551661507² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12551661547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27167868 + ... + 27168329.

It is an arithmetic number, because the mean of its divisors is an integer number (1304068752).

Almost surely, 2^12551661507 is an apocalyptic number.

12551661507 is a deficient number, since it is larger than the sum of its proper divisors (8313438525).

12551661507 is a wasteful number, since it uses less digits than its factorization.

12551661507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54336218.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 12551661507 in words is "twelve billion, five hundred fifty-one million, six hundred sixty-one thousand, five hundred seven".