42000400025 has 6 divisors (see below), whose sum is σ = 52080496062. Its totient is φ = 33600320000.

The previous prime is 42000399953. The next prime is 42000400037. The reversal of 42000400025 is 52000400024.

It can be written as a sum of positive squares in 3 ways, for example, as 234120601 + 41766279424 = 15301^2 + 204368^2 .

It is not a de Polignac number, because 42000400025 - 2²⁶ = 41933291161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42000399976 and 42000400012.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 840007976 + ... + 840008025.

It is an arithmetic number, because the mean of its divisors is an integer number (8680082677).

Almost surely, 2^42000400025 is an apocalyptic number.

It is an amenable number.

42000400025 is a deficient number, since it is larger than the sum of its proper divisors (10080096037).

42000400025 is a wasteful number, since it uses less digits than its factorization.

42000400025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680016011 (or 1680016006 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

Adding to 42000400025 its reverse (52000400024), we get a palindrome (94000800049).

Subtracting 42000400025 from its reverse (52000400024), we obtain a palindrome (9999999999).

The spelling of 42000400025 in words is "forty-two billion, four hundred thousand, twenty-five".