526816661 has 16 divisors (see below), whose sum is σ = 615081600. Its totient is φ = 441849408.

The previous prime is 526816657. The next prime is 526816673. The reversal of 526816661 is 166618625.

It is a happy number.

It is not a de Polignac number, because 526816661 - 2² = 526816657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (526816061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153755 + ... + 157143.

It is an arithmetic number, because the mean of its divisors is an integer number (38442600).

Almost surely, 2^526816661 is an apocalyptic number.

It is an amenable number.

526816661 is a deficient number, since it is larger than the sum of its proper divisors (88264939).

526816661 is a wasteful number, since it uses less digits than its factorization.

526816661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868.

The product of its digits is 103680, while the sum is 41.

The square root of 526816661 is about 22952.4870329993. The cubic root of 526816661 is about 807.6437447904.

The spelling of 526816661 in words is "five hundred twenty-six million, eight hundred sixteen thousand, six hundred sixty-one".