643154355367 has 4 divisors (see below), whose sum is σ = 643840753696. Its totient is φ = 642467957040.

The previous prime is 643154355331. The next prime is 643154355401. The reversal of 643154355367 is 763553451346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643154355367 - 2¹⁵ = 643154322599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643154055367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343197759 + ... + 343199632.

It is an arithmetic number, because the mean of its divisors is an integer number (160960188424).

Almost surely, 2^643154355367 is an apocalyptic number.

643154355367 is a deficient number, since it is larger than the sum of its proper divisors (686398329).

643154355367 is an equidigital number, since it uses as much as digits as its factorization.

643154355367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686398328.

The product of its digits is 13608000, while the sum is 52.

The spelling of 643154355367 in words is "six hundred forty-three billion, one hundred fifty-four million, three hundred fifty-five thousand, three hundred sixty-seven".