5126776681 has 4 divisors (see below), whose sum is σ = 5521144132. Its totient is φ = 4732409232.

The previous prime is 5126776679. The next prime is 5126776691. The reversal of 5126776681 is 1866776215.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2488413456 + 2638363225 = 49884^2 + 51365^2 .

It is a cyclic number.

It is not a de Polignac number, because 5126776681 - 2¹ = 5126776679 is a prime.

It is a super-2 number, since 2×5126776681² = 52567678273690751522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5126776661) 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, 197183706 + ... + 197183731.

It is an arithmetic number, because the mean of its divisors is an integer number (1380286033).

Almost surely, 2^5126776681 is an apocalyptic number.

It is an amenable number.

5126776681 is a deficient number, since it is larger than the sum of its proper divisors (394367451).

5126776681 is a wasteful number, since it uses less digits than its factorization.

5126776681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394367450.

The product of its digits is 846720, while the sum is 49.

The square root of 5126776681 is about 71601.5131194865. The cubic root of 5126776681 is about 1724.3078291100.

The spelling of 5126776681 in words is "five billion, one hundred twenty-six million, seven hundred seventy-six thousand, six hundred eighty-one".