1605626545 has 4 divisors (see below), whose sum is σ = 1926751860. Its totient is φ = 1284501232.

The previous prime is 1605626513. The next prime is 1605626551. The reversal of 1605626545 is 5456265061.

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 1253726464 + 351900081 = 35408^2 + 18759^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605626545 - 2⁵ = 1605626513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1605626498 and 1605626507.

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, 160562650 + ... + 160562659.

It is an arithmetic number, because the mean of its divisors is an integer number (481687965).

Almost surely, 2^1605626545 is an apocalyptic number.

It is an amenable number.

1605626545 is a deficient number, since it is larger than the sum of its proper divisors (321125315).

1605626545 is an equidigital number, since it uses as much as digits as its factorization.

1605626545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321125314.

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 1605626545 is about 40070.2700889325. The cubic root of 1605626545 is about 1170.9765011062.

The spelling of 1605626545 in words is "one billion, six hundred five million, six hundred twenty-six thousand, five hundred forty-five".