25605420123 has 8 divisors (see below), whose sum is σ = 34344995328. Its totient is φ = 16968062504.

The previous prime is 25605420119. The next prime is 25605420133. The reversal of 25605420123 is 32102450652.

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 25605420123 - 2² = 25605420119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25605420133) 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, 25553811 + ... + 25554812.

It is an arithmetic number, because the mean of its divisors is an integer number (4293124416).

Almost surely, 2^25605420123 is an apocalyptic number.

25605420123 is a deficient number, since it is larger than the sum of its proper divisors (8739575205).

25605420123 is a wasteful number, since it uses less digits than its factorization.

25605420123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51108793.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 25605420123 its reverse (32102450652), we get a palindrome (57707870775).

The spelling of 25605420123 in words is "twenty-five billion, six hundred five million, four hundred twenty thousand, one hundred twenty-three".