643259972095 has 32 divisors (see below), whose sum is σ = 893659898880. Its totient is φ = 440446584960.

The previous prime is 643259972093. The next prime is 643259972101. The reversal of 643259972095 is 590279952346.

It is not a de Polignac number, because 643259972095 - 2¹ = 643259972093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643259972093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5483001 + ... + 5599090.

It is an arithmetic number, because the mean of its divisors is an integer number (27926871840).

Almost surely, 2^643259972095 is an apocalyptic number.

643259972095 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

643259972095 is a deficient number, since it is larger than the sum of its proper divisors (250399926785).

643259972095 is a wasteful number, since it uses less digits than its factorization.

643259972095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11082175.

The product of its (nonzero) digits is 36741600, while the sum is 61.

The spelling of 643259972095 in words is "six hundred forty-three billion, two hundred fifty-nine million, nine hundred seventy-two thousand, ninety-five".