425440518165 has 24 divisors (see below), whose sum is σ = 794155635000. Its totient is φ = 209447639424.

The previous prime is 425440518157. The next prime is 425440518187. The reversal of 425440518165 is 561815044524.

425440518165 is a `hidden beast` number, since 4 + 2 + 5 + 4 + 405 + 181 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 556865604 + 424883652561 = 23598^2 + 651831^2 .

It is not a de Polignac number, because 425440518165 - 2³ = 425440518157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 425440518165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363623790 + ... + 363624959.

It is an arithmetic number, because the mean of its divisors is an integer number (33089818125).

Almost surely, 2^425440518165 is an apocalyptic number.

425440518165 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

425440518165 is a deficient number, since it is larger than the sum of its proper divisors (368715116835).

425440518165 is a wasteful number, since it uses less digits than its factorization.

425440518165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727248773 (or 727248770 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 45.

The spelling of 425440518165 in words is "four hundred twenty-five billion, four hundred forty million, five hundred eighteen thousand, one hundred sixty-five".