643354695 has 24 divisors (see below), whose sum is σ = 1123938816. Its totient is φ = 340417728.

The previous prime is 643354639. The next prime is 643354711. The reversal of 643354695 is 596453346.

It is not a de Polignac number, because 643354695 - 2¹⁰ = 643353671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 643354695.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50572 + ... + 62001.

It is an arithmetic number, because the mean of its divisors is an integer number (46830784).

Almost surely, 2^643354695 is an apocalyptic number.

643354695 is a deficient number, since it is larger than the sum of its proper divisors (480584121).

643354695 is a wasteful number, since it uses less digits than its factorization.

643354695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112711 (or 112708 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The square root of 643354695 is about 25364.4376046464. The cubic root of 643354695 is about 863.2769759759.

The spelling of 643354695 in words is "six hundred forty-three million, three hundred fifty-four thousand, six hundred ninety-five".