6526129681 has 4 divisors (see below), whose sum is σ = 6664983552. Its totient is φ = 6387275812.

The previous prime is 6526129657. The next prime is 6526129691. The reversal of 6526129681 is 1869216256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6526129681 - 2¹¹ = 6526127633 is a prime.

It is a super-2 number, since 2×6526129681² = 85180737226458323522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6526129601) 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, 69426865 + ... + 69426958.

It is an arithmetic number, because the mean of its divisors is an integer number (1666245888).

Almost surely, 2^6526129681 is an apocalyptic number.

It is an amenable number.

6526129681 is a deficient number, since it is larger than the sum of its proper divisors (138853871).

6526129681 is a wasteful number, since it uses less digits than its factorization.

6526129681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138853870.

The product of its digits is 311040, while the sum is 46.

The square root of 6526129681 is about 80784.4643542309. The cubic root of 6526129681 is about 1868.7529868507.

The spelling of 6526129681 in words is "six billion, five hundred twenty-six million, one hundred twenty-nine thousand, six hundred eighty-one".