25697487749 has 8 divisors (see below), whose sum is σ = 25747133280. Its totient is φ = 25647879600.

The previous prime is 25697487709. The next prime is 25697487763. The reversal of 25697487749 is 94778479652.

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

It is a cyclic number.

It is not a de Polignac number, because 25697487749 - 2¹⁶ = 25697422213 is a prime.

It is a super-2 number, since 2×25697487749² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25697487709) 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 7 ways as a sum of consecutive naturals, for example, 1637462 + ... + 1653080.

It is an arithmetic number, because the mean of its divisors is an integer number (3218391660).

Almost surely, 2^25697487749 is an apocalyptic number.

It is an amenable number.

25697487749 is a deficient number, since it is larger than the sum of its proper divisors (49645531).

25697487749 is a wasteful number, since it uses less digits than its factorization.

25697487749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18691.

The product of its digits is 213373440, while the sum is 68.

The spelling of 25697487749 in words is "twenty-five billion, six hundred ninety-seven million, four hundred eighty-seven thousand, seven hundred forty-nine".