4521643690 has 8 divisors (see below), whose sum is σ = 8138958660. Its totient is φ = 1808657472.

The previous prime is 4521643681. The next prime is 4521643691. The reversal of 4521643690 is 963461254.

It can be written as a sum of positive squares in 2 ways, for example, as 4395822601 + 125821089 = 66301^2 + 11217^2 .

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

It is a super-2 number, since 2×4521643690² = 40890523318633632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4521643691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226082175 + ... + 226082194.

Almost surely, 2^4521643690 is an apocalyptic number.

4521643690 is a deficient number, since it is larger than the sum of its proper divisors (3617314970).

4521643690 is a wasteful number, since it uses less digits than its factorization.

4521643690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452164376.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 4521643690 is about 67243.1683518854. The cubic root of 4521643690 is about 1653.6062769750.

The spelling of 4521643690 in words is "four billion, five hundred twenty-one million, six hundred forty-three thousand, six hundred ninety".