25618643 has 4 divisors (see below), whose sum is σ = 27125640. Its totient is φ = 24111648.

The previous prime is 25618633. The next prime is 25618657. The reversal of 25618643 is 34681652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25618643 - 2¹⁴ = 25602259 is a prime.

It is a super-2 number, since 2×25618643² = 1312629738322898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25618633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753473 + ... + 753506.

It is an arithmetic number, because the mean of its divisors is an integer number (6781410).

Almost surely, 2^25618643 is an apocalyptic number.

25618643 is a deficient number, since it is larger than the sum of its proper divisors (1506997).

25618643 is a wasteful number, since it uses less digits than its factorization.

25618643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506996.

The product of its digits is 34560, while the sum is 35.

The square root of 25618643 is about 5061.4862441777. The cubic root of 25618643 is about 294.7940456555.

The spelling of 25618643 in words is "twenty-five million, six hundred eighteen thousand, six hundred forty-three".