2643901025 has 18 divisors (see below), whose sum is σ = 3341550450. Its totient is φ = 2075157760.

The previous prime is 2643901019. The next prime is 2643901067. The reversal of 2643901025 is 5201093462.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 707281 + 2643193744 = 841^2 + 51412^2 .

It is not a de Polignac number, because 2643901025 - 2²⁶ = 2576792161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2643900982 and 2643901000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 51401 + ... + 89049.

Almost surely, 2^2643901025 is an apocalyptic number.

2643901025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2643901025 is a deficient number, since it is larger than the sum of its proper divisors (697649425).

2643901025 is an equidigital number, since it uses as much as digits as its factorization.

2643901025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37765 (or 37707 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2643901025 is about 51418.8780993907. The cubic root of 2643901025 is about 1382.7650618240.

Adding to 2643901025 its reverse (5201093462), we get a palindrome (7844994487).

The spelling of 2643901025 in words is "two billion, six hundred forty-three million, nine hundred one thousand, twenty-five".