1645673362 has 4 divisors (see below), whose sum is σ = 2468510046. Its totient is φ = 822836680.

The previous prime is 1645673357. The next prime is 1645673377. The reversal of 1645673362 is 2633765461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2633765461 = 47 ⋅56037563.

It can be written as a sum of positive squares in only one way, i.e., 1590334641 + 55338721 = 39879^2 + 7439^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411418339 + ... + 411418342.

Almost surely, 2^1645673362 is an apocalyptic number.

1645673362 is a deficient number, since it is larger than the sum of its proper divisors (822836684).

1645673362 is an equidigital number, since it uses as much as digits as its factorization.

1645673362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822836683.

The product of its digits is 544320, while the sum is 43.

The square root of 1645673362 is about 40566.8998322524. The cubic root of 1645673362 is about 1180.6319898095.

The spelling of 1645673362 in words is "one billion, six hundred forty-five million, six hundred seventy-three thousand, three hundred sixty-two".