1645352445 has 64 divisors (see below), whose sum is σ = 2967793920. Its totient is φ = 771379200.

The previous prime is 1645352441. The next prime is 1645352461. The reversal of 1645352445 is 5442535461.

It is not a de Polignac number, because 1645352445 - 2² = 1645352441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645352441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1104261 + ... + 1105749.

It is an arithmetic number, because the mean of its divisors is an integer number (46371780).

Almost surely, 2^1645352445 is an apocalyptic number.

1645352445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645352445 is a deficient number, since it is larger than the sum of its proper divisors (1322441475).

1645352445 is a wasteful number, since it uses less digits than its factorization.

1645352445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726.

The product of its digits is 288000, while the sum is 39.

The square root of 1645352445 is about 40562.9442348555. The cubic root of 1645352445 is about 1180.5552411837. Note that the first 3 decimals are identical.

The spelling of 1645352445 in words is "one billion, six hundred forty-five million, three hundred fifty-two thousand, four hundred forty-five".