6646423506 has 8 divisors (see below), whose sum is σ = 13292847024. Its totient is φ = 2215474500.

The previous prime is 6646423471. The next prime is 6646423507. The reversal of 6646423506 is 6053246466.

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

6646423506 is an admirable number.

It is a super-2 number, since 2×6646423506² = 88349890842218664072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6646423507) 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, 553868620 + ... + 553868631.

It is an arithmetic number, because the mean of its divisors is an integer number (1661605878).

Almost surely, 2^6646423506 is an apocalyptic number.

6646423506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6646423506 is a wasteful number, since it uses less digits than its factorization.

6646423506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107737256.

The product of its (nonzero) digits is 622080, while the sum is 42.

The square root of 6646423506 is about 81525.6003105773. The cubic root of 6646423506 is about 1880.1651720354.

The spelling of 6646423506 in words is "six billion, six hundred forty-six million, four hundred twenty-three thousand, five hundred six".