25656423349 has 8 divisors (see below), whose sum is σ = 27015680000. Its totient is φ = 24298058592.

The previous prime is 25656423323. The next prime is 25656423361. The reversal of 25656423349 is 94332465652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25656423349 is a prime.

It is a super-2 number, since 2×25656423349² (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 (25656423319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163509 + ... + 279370.

It is an arithmetic number, because the mean of its divisors is an integer number (3376960000).

Almost surely, 2^25656423349 is an apocalyptic number.

It is an amenable number.

25656423349 is a deficient number, since it is larger than the sum of its proper divisors (1359256651).

25656423349 is a wasteful number, since it uses less digits than its factorization.

25656423349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445947.

The product of its digits is 4665600, while the sum is 49.

The spelling of 25656423349 in words is "twenty-five billion, six hundred fifty-six million, four hundred twenty-three thousand, three hundred forty-nine".