12761636805 has 32 divisors (see below), whose sum is σ = 23881430400. Its totient is φ = 6447983616.

The previous prime is 12761636759. The next prime is 12761636819. The reversal of 12761636805 is 50863616721.

12761636805 is a `hidden beast` number, since 1 + 2 + 7 + 6 + 1 + 636 + 8 + 0 + 5 = 666.

It is not a de Polignac number, because 12761636805 - 2⁷ = 12761636677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2485084 + ... + 2490213.

It is an arithmetic number, because the mean of its divisors is an integer number (746294700).

Almost surely, 2^12761636805 is an apocalyptic number.

12761636805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12761636805 is a deficient number, since it is larger than the sum of its proper divisors (11119793595).

12761636805 is a wasteful number, since it uses less digits than its factorization.

12761636805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975330 (or 4975324 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 12761636805 in words is "twelve billion, seven hundred sixty-one million, six hundred thirty-six thousand, eight hundred five".