25695438490 has 8 divisors (see below), whose sum is σ = 46251789300. Its totient is φ = 10278175392.

The previous prime is 25695438401. The next prime is 25695438499. The reversal of 25695438490 is 9483459652.

It can be written as a sum of positive squares in 2 ways, for example, as 20782970569 + 4912467921 = 144163^2 + 70089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (25695438499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284771915 + ... + 1284771934.

Almost surely, 2^25695438490 is an apocalyptic number.

25695438490 is a deficient number, since it is larger than the sum of its proper divisors (20556350810).

25695438490 is a wasteful number, since it uses less digits than its factorization.

25695438490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569543856.

The product of its (nonzero) digits is 9331200, while the sum is 55.

The spelling of 25695438490 in words is "twenty-five billion, six hundred ninety-five million, four hundred thirty-eight thousand, four hundred ninety".