1025665633 has 4 divisors (see below), whose sum is σ = 1027112980. Its totient is φ = 1024218288.

The previous prime is 1025665621. The next prime is 1025665661. The reversal of 1025665633 is 3365665201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3365665201 = 53 ⋅63503117.

It can be written as a sum of positive squares in 2 ways, for example, as 412211809 + 613453824 = 20303^2 + 24768^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025665633 - 2¹⁷ = 1025534561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1025665592 and 1025665601.

It is not an unprimeable number, because it can be changed into a prime (1025665033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722610 + ... + 724027.

It is an arithmetic number, because the mean of its divisors is an integer number (256778245).

Almost surely, 2^1025665633 is an apocalyptic number.

It is an amenable number.

1025665633 is a deficient number, since it is larger than the sum of its proper divisors (1447347).

1025665633 is an equidigital number, since it uses as much as digits as its factorization.

1025665633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447346.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 1025665633 is about 32026.0149409820. The cubic root of 1025665633 is about 1008.4830454540.

The spelling of 1025665633 in words is "one billion, twenty-five million, six hundred sixty-five thousand, six hundred thirty-three".