12557661767 has 4 divisors (see below), whose sum is σ = 14351613456. Its totient is φ = 10763710080.

The previous prime is 12557661761. The next prime is 12557661803. The reversal of 12557661767 is 76716675521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12557661767 - 2⁸ = 12557661511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12557661761) 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, 896975834 + ... + 896975847.

It is an arithmetic number, because the mean of its divisors is an integer number (3587903364).

Almost surely, 2^12557661767 is an apocalyptic number.

12557661767 is a deficient number, since it is larger than the sum of its proper divisors (1793951689).

12557661767 is an equidigital number, since it uses as much as digits as its factorization.

12557661767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793951688.

The product of its digits is 3704400, while the sum is 53.

The spelling of 12557661767 in words is "twelve billion, five hundred fifty-seven million, six hundred sixty-one thousand, seven hundred sixty-seven".