6646726437 has 8 divisors (see below), whose sum is σ = 9544017504. Its totient is φ = 4090293168.

The previous prime is 6646726397. The next prime is 6646726451. The reversal of 6646726437 is 7346276466.

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

It is not a de Polignac number, because 6646726437 - 2¹⁰ = 6646725413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6646726437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646726477) 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, 85214403 + ... + 85214480.

It is an arithmetic number, because the mean of its divisors is an integer number (1193002188).

Almost surely, 2^6646726437 is an apocalyptic number.

It is an amenable number.

6646726437 is a deficient number, since it is larger than the sum of its proper divisors (2897291067).

6646726437 is a wasteful number, since it uses less digits than its factorization.

6646726437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170428899.

The product of its digits is 6096384, while the sum is 51.

The square root of 6646726437 is about 81527.4581782113. The cubic root of 6646726437 is about 1880.1937363534.

The spelling of 6646726437 in words is "six billion, six hundred forty-six million, seven hundred twenty-six thousand, four hundred thirty-seven".