826541661 has 16 divisors (see below), whose sum is σ = 1203130368. Its totient is φ = 500564400.

The previous prime is 826541647. The next prime is 826541663. The reversal of 826541661 is 166145628.

It is a happy number.

It is not a de Polignac number, because 826541661 - 2⁷ = 826541533 is a prime.

It is a super-2 number, since 2×826541661² = 1366342234737277842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (826541663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40030 + ... + 57056.

It is an arithmetic number, because the mean of its divisors is an integer number (75195648).

Almost surely, 2^826541661 is an apocalyptic number.

It is an amenable number.

826541661 is a deficient number, since it is larger than the sum of its proper divisors (376588707).

826541661 is a wasteful number, since it uses less digits than its factorization.

826541661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18512.

The product of its digits is 69120, while the sum is 39.

The square root of 826541661 is about 28749.6375803244. The cubic root of 826541661 is about 938.4725687995.

The spelling of 826541661 in words is "eight hundred twenty-six million, five hundred forty-one thousand, six hundred sixty-one".