25998628981 has 8 divisors (see below), whose sum is σ = 28901702144. Its totient is φ = 23224581360.

The previous prime is 25998628973. The next prime is 25998629009. The reversal of 25998628981 is 18982689952.

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 25998628981 - 2³ = 25998628973 is a prime.

It is a super-2 number, since 2×25998628981² (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 (25998626981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32255961 + ... + 32256766.

It is an arithmetic number, because the mean of its divisors is an integer number (3612712768).

Almost surely, 2^25998628981 is an apocalyptic number.

It is an amenable number.

25998628981 is a deficient number, since it is larger than the sum of its proper divisors (2903073163).

25998628981 is a wasteful number, since it uses less digits than its factorization.

25998628981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64512771.

The product of its digits is 44789760, while the sum is 67.

The spelling of 25998628981 in words is "twenty-five billion, nine hundred ninety-eight million, six hundred twenty-eight thousand, nine hundred eighty-one".