3500643649 has 2 divisors, whose sum is σ = 3500643650. Its totient is φ = 3500643648.

The previous prime is 3500643647. The next prime is 3500643683. The reversal of 3500643649 is 9463460053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3157653249 + 342990400 = 56193^2 + 18520^2 .

It is a cyclic number.

It is not a de Polignac number, because 3500643649 - 2¹ = 3500643647 is a prime.

Together with 3500643647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3500643647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1750321824 + 1750321825.

It is an arithmetic number, because the mean of its divisors is an integer number (1750321825).

Almost surely, 2^3500643649 is an apocalyptic number.

It is an amenable number.

3500643649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3500643649 is an equidigital number, since it uses as much as digits as its factorization.

3500643649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 3500643649 is about 59166.2374078325. The cubic root of 3500643649 is about 1518.3875515405.

The spelling of 3500643649 in words is "three billion, five hundred million, six hundred forty-three thousand, six hundred forty-nine".