25629999081 has 8 divisors (see below), whose sum is σ = 34175884704. Its totient is φ = 17085389760.

The previous prime is 25629999079. The next prime is 25629999097. The reversal of 25629999081 is 18099992652.

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

It is not a de Polignac number, because 25629999081 - 2¹ = 25629999079 is a prime.

It is a super-2 number, since 2×25629999081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25629999781) 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, 271191 + ... + 353276.

It is an arithmetic number, because the mean of its divisors is an integer number (4271985588).

Almost surely, 2^25629999081 is an apocalyptic number.

It is an amenable number.

25629999081 is a deficient number, since it is larger than the sum of its proper divisors (8545885623).

25629999081 is a wasteful number, since it uses less digits than its factorization.

25629999081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638151.

The product of its (nonzero) digits is 6298560, while the sum is 60.

The spelling of 25629999081 in words is "twenty-five billion, six hundred twenty-nine million, nine hundred ninety-nine thousand, eighty-one".