825944661 has 8 divisors (see below), whose sum is σ = 1223621760. Its totient is φ = 550629756.

The previous prime is 825944659. The next prime is 825944681. The reversal of 825944661 is 166449528.

It is not a de Polignac number, because 825944661 - 2¹ = 825944659 is a prime.

It is a super-3 number, since 3×825944661³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825944681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15295245 + ... + 15295298.

It is an arithmetic number, because the mean of its divisors is an integer number (152952720).

Almost surely, 2^825944661 is an apocalyptic number.

It is an amenable number.

825944661 is a deficient number, since it is larger than the sum of its proper divisors (397677099).

825944661 is a wasteful number, since it uses less digits than its factorization.

825944661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30590552 (or 30590546 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 825944661 is about 28739.2529652390. The cubic root of 825944661 is about 938.2465656446.

The spelling of 825944661 in words is "eight hundred twenty-five million, nine hundred forty-four thousand, six hundred sixty-one".