1645452505 has 8 divisors (see below), whose sum is σ = 1974831552. Its totient is φ = 1316169648.

The previous prime is 1645452481. The next prime is 1645452521. The reversal of 1645452505 is 5052545461.

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

It is a cyclic number.

It is not a de Polignac number, because 1645452505 - 2²⁵ = 1611898073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21402 + ... + 61228.

It is an arithmetic number, because the mean of its divisors is an integer number (246853944).

Almost surely, 2^1645452505 is an apocalyptic number.

It is an amenable number.

1645452505 is a deficient number, since it is larger than the sum of its proper divisors (329379047).

1645452505 is an equidigital number, since it uses as much as digits as its factorization.

1645452505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48095.

The product of its (nonzero) digits is 120000, while the sum is 37.

The square root of 1645452505 is about 40564.1776078352. The cubic root of 1645452505 is about 1180.5791720165.

Adding to 1645452505 its reverse (5052545461), we get a palindrome (6697997966).

The spelling of 1645452505 in words is "one billion, six hundred forty-five million, four hundred fifty-two thousand, five hundred five".