643266012165 has 16 divisors (see below), whose sum is σ = 1176257851008. Its totient is φ = 294064462656.

The previous prime is 643266012139. The next prime is 643266012187. The reversal of 643266012165 is 561210662346.

It is not a de Polignac number, because 643266012165 - 2¹⁴ = 643265995781 is a prime.

It is a super-3 number, since 3×643266012165³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3063171382 + ... + 3063171591.

It is an arithmetic number, because the mean of its divisors is an integer number (73516115688).

Almost surely, 2^643266012165 is an apocalyptic number.

It is an amenable number.

643266012165 is a deficient number, since it is larger than the sum of its proper divisors (532991838843).

643266012165 is a wasteful number, since it uses less digits than its factorization.

643266012165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126342988.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 643266012165 in words is "six hundred forty-three billion, two hundred sixty-six million, twelve thousand, one hundred sixty-five".