25678734981 has 8 divisors (see below), whose sum is σ = 34239537024. Its totient is φ = 17118544800.

The previous prime is 25678734943. The next prime is 25678735007. The reversal of 25678734981 is 18943787652.

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

It is not a de Polignac number, because 25678734981 - 2⁷ = 25678734853 is a prime.

It is a super-2 number, since 2×25678734981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25678734581) 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, 43936 + ... + 230841.

It is an arithmetic number, because the mean of its divisors is an integer number (4279942128).

Almost surely, 2^25678734981 is an apocalyptic number.

It is an amenable number.

25678734981 is a deficient number, since it is larger than the sum of its proper divisors (8560802043).

25678734981 is a wasteful number, since it uses less digits than its factorization.

25678734981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305931.

The product of its digits is 20321280, while the sum is 60.

The spelling of 25678734981 in words is "twenty-five billion, six hundred seventy-eight million, seven hundred thirty-four thousand, nine hundred eighty-one".