1665426425 has 24 divisors (see below), whose sum is σ = 2284109016. Its totient is φ = 1196605440.

The previous prime is 1665426419. The next prime is 1665426463. The reversal of 1665426425 is 5246245661.

It can be written as a sum of positive squares in 12 ways, for example, as 898081024 + 767345401 = 29968^2 + 27701^2 .

It is not a de Polignac number, because 1665426425 - 2¹⁴ = 1665410041 is a prime.

It is a Duffinian 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, 57224 + ... + 81273.

It is an arithmetic number, because the mean of its divisors is an integer number (95171209).

Almost surely, 2^1665426425 is an apocalyptic number.

It is an amenable number.

1665426425 is a deficient number, since it is larger than the sum of its proper divisors (618682591).

1665426425 is a wasteful number, since it uses less digits than its factorization.

1665426425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138557 (or 138552 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The square root of 1665426425 is about 40809.6364232763. The cubic root of 1665426425 is about 1185.3369346984.

The spelling of 1665426425 in words is "one billion, six hundred sixty-five million, four hundred twenty-six thousand, four hundred twenty-five".