825649755949 has 2 divisors, whose sum is σ = 825649755950. Its totient is φ = 825649755948.

The previous prime is 825649755919. The next prime is 825649755967. The reversal of 825649755949 is 949557946528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414278886025 + 411370869924 = 643645^2 + 641382^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825649755949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825649755919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412824877974 + 412824877975.

It is an arithmetic number, because the mean of its divisors is an integer number (412824877975).

Almost surely, 2^825649755949 is an apocalyptic number.

It is an amenable number.

825649755949 is a deficient number, since it is larger than the sum of its proper divisors (1).

825649755949 is an equidigital number, since it uses as much as digits as its factorization.

825649755949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776000, while the sum is 73.

The spelling of 825649755949 in words is "eight hundred twenty-five billion, six hundred forty-nine million, seven hundred fifty-five thousand, nine hundred forty-nine".