643620512111 has 8 divisors (see below), whose sum is σ = 665480433744. Its totient is φ = 622054012480.

The previous prime is 643620512107. The next prime is 643620512147. The reversal of 643620512111 is 111215026346.

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

It is a cyclic number.

It is not a de Polignac number, because 643620512111 - 2² = 643620512107 is a prime.

It is a super-2 number, since 2×643620512111² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643620512611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73351040 + ... + 73359813.

It is an arithmetic number, because the mean of its divisors is an integer number (83185054218).

Almost surely, 2^643620512111 is an apocalyptic number.

643620512111 is a deficient number, since it is larger than the sum of its proper divisors (21859921633).

643620512111 is a wasteful number, since it uses less digits than its factorization.

643620512111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146711001.

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 643620512111 its reverse (111215026346), we get a palindrome (754835538457).

The spelling of 643620512111 in words is "six hundred forty-three billion, six hundred twenty million, five hundred twelve thousand, one hundred eleven".