12512777905 has 16 divisors (see below), whose sum is σ = 15739282944. Its totient is φ = 9538945920.

The previous prime is 12512777891. The next prime is 12512777909. The reversal of 12512777905 is 50977721521.

It is not a de Polignac number, because 12512777905 - 2²⁹ = 11975906993 is a prime.

It is a super-2 number, since 2×12512777905² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12512777909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700929 + ... + 718558.

It is an arithmetic number, because the mean of its divisors is an integer number (983705184).

Almost surely, 2^12512777905 is an apocalyptic number.

It is an amenable number.

12512777905 is a deficient number, since it is larger than the sum of its proper divisors (3226505039).

12512777905 is a wasteful number, since it uses less digits than its factorization.

12512777905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419576.

The product of its (nonzero) digits is 308700, while the sum is 46.

The spelling of 12512777905 in words is "twelve billion, five hundred twelve million, seven hundred seventy-seven thousand, nine hundred five".