425620165 has 4 divisors (see below), whose sum is σ = 510744204. Its totient is φ = 340496128.

The previous prime is 425620123. The next prime is 425620171. The reversal of 425620165 is 561026524.

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

It can be written as a sum of positive squares in 2 ways, for example, as 286049569 + 139570596 = 16913^2 + 11814^2 .

It is a cyclic number.

It is not a de Polignac number, because 425620165 - 2¹⁷ = 425489093 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42562012 + ... + 42562021.

It is an arithmetic number, because the mean of its divisors is an integer number (127686051).

Almost surely, 2^425620165 is an apocalyptic number.

It is an amenable number.

425620165 is a deficient number, since it is larger than the sum of its proper divisors (85124039).

425620165 is an equidigital number, since it uses as much as digits as its factorization.

425620165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85124038.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 425620165 is about 20630.5638556003. The cubic root of 425620165 is about 752.2128218421.

Adding to 425620165 its reverse (561026524), we get a palindrome (986646689).

The spelling of 425620165 in words is "four hundred twenty-five million, six hundred twenty thousand, one hundred sixty-five".