643262465 has 8 divisors (see below), whose sum is σ = 772053120. Its totient is φ = 514517872.

The previous prime is 643262449. The next prime is 643262467. The reversal of 643262465 is 564262346.

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

It is a cyclic number.

It is not a de Polignac number, because 643262465 - 2⁴ = 643262449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643262467) 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, 40952 + ... + 54438.

It is an arithmetic number, because the mean of its divisors is an integer number (96506640).

Almost surely, 2^643262465 is an apocalyptic number.

It is an amenable number.

643262465 is a deficient number, since it is larger than the sum of its proper divisors (128790655).

643262465 is a wasteful number, since it uses less digits than its factorization.

643262465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23031.

The product of its digits is 207360, while the sum is 38.

The square root of 643262465 is about 25362.6194427942. The cubic root of 643262465 is about 863.2357214698.

The spelling of 643262465 in words is "six hundred forty-three million, two hundred sixty-two thousand, four hundred sixty-five".