25409295242 has 16 divisors (see below), whose sum is σ = 40445843400. Its totient is φ = 11930677248.

The previous prime is 25409295181. The next prime is 25409295253. The reversal of 25409295242 is 24259290452.

It can be written as a sum of positive squares in 4 ways, for example, as 24749267761 + 660027481 = 157319^2 + 25691^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25409295193 and 25409295202.

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, 816953 + ... + 847484.

Almost surely, 2^25409295242 is an apocalyptic number.

25409295242 is a deficient number, since it is larger than the sum of its proper divisors (15036548158).

25409295242 is a wasteful number, since it uses less digits than its factorization.

25409295242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664905.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 25409295242 in words is "twenty-five billion, four hundred nine million, two hundred ninety-five thousand, two hundred forty-two".