643153352 has 8 divisors (see below), whose sum is σ = 1205912550. Its totient is φ = 321576672.

The previous prime is 643153337. The next prime is 643153361. The reversal of 643153352 is 253351346.

It can be written as a sum of positive squares in only one way, i.e., 435389956 + 207763396 = 20866^2 + 14414^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40197077 + ... + 40197092.

Almost surely, 2^643153352 is an apocalyptic number.

It is an amenable number.

643153352 is a deficient number, since it is larger than the sum of its proper divisors (562759198).

643153352 is a wasteful number, since it uses less digits than its factorization.

643153352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80394175 (or 80394171 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

The square root of 643153352 is about 25360.4682922063. The cubic root of 643153352 is about 863.1869101004.

The spelling of 643153352 in words is "six hundred forty-three million, one hundred fifty-three thousand, three hundred fifty-two".