25538428015 has 8 divisors (see below), whose sum is σ = 30651038208. Its totient is φ = 20427459360.

The previous prime is 25538427997. The next prime is 25538428037. The reversal of 25538428015 is 51082483552.

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

It is not a de Polignac number, because 25538428015 - 2⁹ = 25538427503 is a prime.

It is a super-2 number, since 2×25538428015² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375892 + ... + 438601.

It is an arithmetic number, because the mean of its divisors is an integer number (3831379776).

Almost surely, 2^25538428015 is an apocalyptic number.

25538428015 is a deficient number, since it is larger than the sum of its proper divisors (5112610193).

25538428015 is an equidigital number, since it uses as much as digits as its factorization.

25538428015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820769.

The product of its (nonzero) digits is 384000, while the sum is 43.

The spelling of 25538428015 in words is "twenty-five billion, five hundred thirty-eight million, four hundred twenty-eight thousand, fifteen".