643461295 has 8 divisors (see below), whose sum is σ = 774043920. Its totient is φ = 513508800.

The previous prime is 643461289. The next prime is 643461383. The reversal of 643461295 is 592164346.

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

It is not a de Polignac number, because 643461295 - 2¹³ = 643453103 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155281 + ... + 159370.

It is an arithmetic number, because the mean of its divisors is an integer number (96755490).

Almost surely, 2^643461295 is an apocalyptic number.

643461295 is a deficient number, since it is larger than the sum of its proper divisors (130582625).

643461295 is a wasteful number, since it uses less digits than its factorization.

643461295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315065.

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

The square root of 643461295 is about 25366.5388849169. The cubic root of 643461295 is about 863.3246532754.

The spelling of 643461295 in words is "six hundred forty-three million, four hundred sixty-one thousand, two hundred ninety-five".