12511488649 has 4 divisors (see below), whose sum is σ = 13648896720. Its totient is φ = 11374080580.

The previous prime is 12511488601. The next prime is 12511488673. The reversal of 12511488649 is 94688411521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94688411521 = 11 ⋅8608037411.

It is a cyclic number.

It is not a de Polignac number, because 12511488649 - 2²¹ = 12509391497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12511488149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568704019 + ... + 568704040.

It is an arithmetic number, because the mean of its divisors is an integer number (3412224180).

Almost surely, 2^12511488649 is an apocalyptic number.

It is an amenable number.

12511488649 is a deficient number, since it is larger than the sum of its proper divisors (1137408071).

12511488649 is a wasteful number, since it uses less digits than its factorization.

12511488649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137408070.

The product of its digits is 552960, while the sum is 49.

The spelling of 12511488649 in words is "twelve billion, five hundred eleven million, four hundred eighty-eight thousand, six hundred forty-nine".