1645146418 has 4 divisors (see below), whose sum is σ = 2467719630. Its totient is φ = 822573208.

The previous prime is 1645146379. The next prime is 1645146431. The reversal of 1645146418 is 8146415461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8146415461 = 419 ⋅19442519.

It can be written as a sum of positive squares in only one way, i.e., 1351812289 + 293334129 = 36767^2 + 17127^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411286603 + ... + 411286606.

Almost surely, 2^1645146418 is an apocalyptic number.

1645146418 is a deficient number, since it is larger than the sum of its proper divisors (822573212).

1645146418 is an equidigital number, since it uses as much as digits as its factorization.

1645146418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822573211.

The product of its digits is 92160, while the sum is 40.

The square root of 1645146418 is about 40560.4045591264. The cubic root of 1645146418 is about 1180.5059637157.

The spelling of 1645146418 in words is "one billion, six hundred forty-five million, one hundred forty-six thousand, four hundred eighteen".