1025002661 has 2 divisors, whose sum is σ = 1025002662. Its totient is φ = 1025002660.

The previous prime is 1025002637. The next prime is 1025002679. The reversal of 1025002661 is 1662005201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1024960225 + 42436 = 32015^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025002661 - 2⁶ = 1025002597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025002681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512501330 + 512501331.

It is an arithmetic number, because the mean of its divisors is an integer number (512501331).

Almost surely, 2^1025002661 is an apocalyptic number.

It is an amenable number.

1025002661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025002661 is an equidigital number, since it uses as much as digits as its factorization.

1025002661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1025002661 is about 32015.6627449753. The cubic root of 1025002661 is about 1008.2657101263.

Adding to 1025002661 its reverse (1662005201), we get a palindrome (2687007862).

The spelling of 1025002661 in words is "one billion, twenty-five million, two thousand, six hundred sixty-one".