25646142242 has 30 divisors (see below), whose sum is σ = 44897506299. Its totient is φ = 10986447780.

The previous prime is 25646142239. The next prime is 25646142253. The reversal of 25646142242 is 24224164652.

It can be written as a sum of positive squares in only one way, i.e., 12823071121 + 12823071121 = 113239^2 + 113239^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=113239.

It is a super-2 number, since 2×25646142242² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25646142196 and 25646142205.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 11096267 + ... + 11098577.

Almost surely, 2^25646142242 is an apocalyptic number.

25646142242 is a deficient number, since it is larger than the sum of its proper divisors (19251364057).

25646142242 is an frugal number, since it uses more digits than its factorization.

25646142242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4652 (or 2320 counting only the distinct ones).

The product of its digits is 184320, while the sum is 38.

The spelling of 25646142242 in words is "twenty-five billion, six hundred forty-six million, one hundred forty-two thousand, two hundred forty-two".