1643152645 has 8 divisors (see below), whose sum is σ = 1999555200. Its totient is φ = 1296007440.

The previous prime is 1643152597. The next prime is 1643152649. The reversal of 1643152645 is 5462513461.

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

It is not a de Polignac number, because 1643152645 - 2¹⁷ = 1643021573 is a prime.

It is a super-2 number, since 2×1643152645² = 5399901229540992050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643152649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2313945 + ... + 2314654.

It is an arithmetic number, because the mean of its divisors is an integer number (249944400).

Almost surely, 2^1643152645 is an apocalyptic number.

It is an amenable number.

1643152645 is a deficient number, since it is larger than the sum of its proper divisors (356402555).

1643152645 is an equidigital number, since it uses as much as digits as its factorization.

1643152645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4628675.

The product of its digits is 86400, while the sum is 37.

The square root of 1643152645 is about 40535.8192836903. The cubic root of 1643152645 is about 1180.0288810800.

The spelling of 1643152645 in words is "one billion, six hundred forty-three million, one hundred fifty-two thousand, six hundred forty-five".