5126656561 has 16 divisors (see below), whose sum is σ = 5851004544. Its totient is φ = 4449947904.

The previous prime is 5126656547. The next prime is 5126656567. The reversal of 5126656561 is 1656566215.

It is a cyclic number.

It is not a de Polignac number, because 5126656561 - 2¹³ = 5126648369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5126656567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252556 + ... + 272098.

It is an arithmetic number, because the mean of its divisors is an integer number (365687784).

Almost surely, 2^5126656561 is an apocalyptic number.

It is an amenable number.

5126656561 is a deficient number, since it is larger than the sum of its proper divisors (724347983).

5126656561 is a wasteful number, since it uses less digits than its factorization.

5126656561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20760.

The product of its digits is 324000, while the sum is 43.

The square root of 5126656561 is about 71600.6743054840. The cubic root of 5126656561 is about 1724.2943622030.

The spelling of 5126656561 in words is "five billion, one hundred twenty-six million, six hundred fifty-six thousand, five hundred sixty-one".