825565501 has 2 divisors, whose sum is σ = 825565502. Its totient is φ = 825565500.

The previous prime is 825565487. The next prime is 825565547. The reversal of 825565501 is 105565528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 822198276 + 3367225 = 28674^2 + 1835^2 .

It is a cyclic number.

It is not a de Polignac number, because 825565501 - 2⁹ = 825564989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825565801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412782750 + 412782751.

It is an arithmetic number, because the mean of its divisors is an integer number (412782751).

Almost surely, 2^825565501 is an apocalyptic number.

It is an amenable number.

825565501 is a deficient number, since it is larger than the sum of its proper divisors (1).

825565501 is an equidigital number, since it uses as much as digits as its factorization.

825565501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60000, while the sum is 37.

The square root of 825565501 is about 28732.6556551948. The cubic root of 825565501 is about 938.1029724819.

The spelling of 825565501 in words is "eight hundred twenty-five million, five hundred sixty-five thousand, five hundred one".