25946170438 has 4 divisors (see below), whose sum is σ = 38919255660. Its totient is φ = 12973085218.

The previous prime is 25946170417. The next prime is 25946170493. The reversal of 25946170438 is 83407164952.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×25946170438² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 25946170391 and 25946170400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6486542608 + ... + 6486542611.

It is an arithmetic number, because the mean of its divisors is an integer number (9729813915).

It is a 2-persistent number, because it is pandigital, and so is 2⋅25946170438 = 51892340876, but 3⋅25946170438 = 77838511314 is not.

Almost surely, 2^25946170438 is an apocalyptic number.

25946170438 is a deficient number, since it is larger than the sum of its proper divisors (12973085222).

25946170438 is a wasteful number, since it uses less digits than its factorization.

25946170438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12973085221.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 25946170438 in words is "twenty-five billion, nine hundred forty-six million, one hundred seventy thousand, four hundred thirty-eight".