825220873566 has 16 divisors (see below), whose sum is σ = 1833824163600. Its totient is φ = 275073624504.

The previous prime is 825220873537. The next prime is 825220873649. The reversal of 825220873566 is 665378022528.

It is a happy number.

825220873566 is a `hidden beast` number, since 8 + 2 + 5 + 2 + 2 + 0 + 8 + 73 + 566 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 15281868029 = 825220873566 / (8 + 2 + 5 + 2 + 2 + 0 + 8 + 7 + 3 + 5 + 6 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7640933961 + ... + 7640934068.

It is an arithmetic number, because the mean of its divisors is an integer number (114614010225).

Almost surely, 2^825220873566 is an apocalyptic number.

825220873566 is an abundant number, since it is smaller than the sum of its proper divisors (1008603290034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

825220873566 is a wasteful number, since it uses less digits than its factorization.

825220873566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15281868040 (or 15281868034 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 825220873566 in words is "eight hundred twenty-five billion, two hundred twenty million, eight hundred seventy-three thousand, five hundred sixty-six".