1645107826 has 8 divisors (see below), whose sum is σ = 2470139820. Its totient is φ = 821727888.

The previous prime is 1645107791. The next prime is 1645107829. The reversal of 1645107826 is 6287015461.

It can be written as a sum of positive squares in 2 ways, for example, as 1612102801 + 33005025 = 40151^2 + 5745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1645107829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410521 + ... + 414508.

Almost surely, 2^1645107826 is an apocalyptic number.

1645107826 is a deficient number, since it is larger than the sum of its proper divisors (825031994).

1645107826 is an equidigital number, since it uses as much as digits as its factorization.

1645107826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826028.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1645107826 is about 40559.9288214366. The cubic root of 1645107826 is about 1180.4967328367.

The spelling of 1645107826 in words is "one billion, six hundred forty-five million, one hundred seven thousand, eight hundred twenty-six".