6638404343 has 4 divisors (see below), whose sum is σ = 6656896080. Its totient is φ = 6619912608.

The previous prime is 6638404337. The next prime is 6638404351. The reversal of 6638404343 is 3434048366.

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 6638404343 - 2¹² = 6638400247 is a prime.

It is a super-2 number, since 2×6638404343² = 88136824442322523298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6638404343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638404313) 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, 9245330 + ... + 9246047.

It is an arithmetic number, because the mean of its divisors is an integer number (1664224020).

Almost surely, 2^6638404343 is an apocalyptic number.

6638404343 is a deficient number, since it is larger than the sum of its proper divisors (18491737).

6638404343 is a wasteful number, since it uses less digits than its factorization.

6638404343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18491736.

The product of its (nonzero) digits is 497664, while the sum is 41.

The square root of 6638404343 is about 81476.4035963787. The cubic root of 6638404343 is about 1879.4087040977.

The spelling of 6638404343 in words is "six billion, six hundred thirty-eight million, four hundred four thousand, three hundred forty-three".