25402728647617 has 8 divisors (see below), whose sum is σ = 25524258653160. Its totient is φ = 25281399354240.

The previous prime is 25402728647599. The next prime is 25402728647669. The reversal of 25402728647617 is 71674682720452.

It can be written as a sum of positive squares in 4 ways, for example, as 124267530256 + 25278461117361 = 352516^2 + 5027769^2 .

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 25402728647617 - 2²³ = 25402720259009 is a prime.

It is a super-2 number, since 2×25402728647617² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25402728647687) 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, 49924308 + ... + 50430565.

It is an arithmetic number, because the mean of its divisors is an integer number (3190532331645).

Almost surely, 2^{25402728647617} is an apocalyptic number.

It is an amenable number.

25402728647617 is a deficient number, since it is larger than the sum of its proper divisors (121530005543).

25402728647617 is a wasteful number, since it uses less digits than its factorization.

25402728647617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100356083.

The product of its (nonzero) digits is 63221760, while the sum is 61.

The spelling of 25402728647617 in words is "twenty-five trillion, four hundred two billion, seven hundred twenty-eight million, six hundred forty-seven thousand, six hundred seventeen".