405540312025 has 6 divisors (see below), whose sum is σ = 502869986942. Its totient is φ = 324432249600.

The previous prime is 405540312013. The next prime is 405540312029. The reversal of 405540312025 is 520213045504.

It can be written as a sum of positive squares in 3 ways, for example, as 33807441424 + 371732870601 = 183868^2 + 609699^2 .

It is not a de Polignac number, because 405540312025 - 2¹⁷ = 405540180953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405540312029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8110806216 + ... + 8110806265.

Almost surely, 2^405540312025 is an apocalyptic number.

It is an amenable number.

405540312025 is a deficient number, since it is larger than the sum of its proper divisors (97329674917).

405540312025 is a wasteful number, since it uses less digits than its factorization.

405540312025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16221612491 (or 16221612486 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 405540312025 its reverse (520213045504), we get a palindrome (925753357529).

The spelling of 405540312025 in words is "four hundred five billion, five hundred forty million, three hundred twelve thousand, twenty-five".