643374035236 has 9 divisors (see below), whose sum is σ = 1125907369041. Its totient is φ = 321686215512.

The previous prime is 643374035233. The next prime is 643374035287. The reversal of 643374035236 is 632530473346.

The square root of 643374035236 is 802106.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 111723062500 + 531650972736 = 334250^2 + 729144^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643374035233) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1403686 + ... + 1804738.

Almost surely, 2^643374035236 is an apocalyptic number.

643374035236 is the 802106-th square number.

It is an amenable number.

643374035236 is a deficient number, since it is larger than the sum of its proper divisors (482533333805).

643374035236 is an frugal number, since it uses more digits than its factorization.

643374035236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802110 (or 401055 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 46.

The spelling of 643374035236 in words is "six hundred forty-three billion, three hundred seventy-four million, thirty-five thousand, two hundred thirty-six".