642033025 has 6 divisors (see below), whose sum is σ = 796120982. Its totient is φ = 513626400.

The previous prime is 642033023. The next prime is 642033053. The reversal of 642033025 is 520330246.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 200024449 + 442008576 = 14143^2 + 21024^2 .

It is not a de Polignac number, because 642033025 - 2¹ = 642033023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 25681321 = 642033025 / (6 + 4 + 2 + 0 + 3 + 3 + 0 + 2 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642033023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12840636 + ... + 12840685.

Almost surely, 2^642033025 is an apocalyptic number.

It is an amenable number.

642033025 is a deficient number, since it is larger than the sum of its proper divisors (154087957).

642033025 is a wasteful number, since it uses less digits than its factorization.

642033025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25681331 (or 25681326 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 642033025 is about 25338.3706066511. The cubic root of 642033025 is about 862.6854155740.

The spelling of 642033025 in words is "six hundred forty-two million, thirty-three thousand, twenty-five".