6663426 has 32 divisors (see below), whose sum is σ = 16616448. Its totient is φ = 1730640.

The previous prime is 6663407. The next prime is 6663431. The reversal of 6663426 is 6243666.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6750 + ... + 7673.

It is an arithmetic number, because the mean of its divisors is an integer number (519264).

Almost surely, 2^6663426 is an apocalyptic number.

6663426 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6663426 is an abundant number, since it is smaller than the sum of its proper divisors (9953022).

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

6663426 is a wasteful number, since it uses less digits than its factorization.

6663426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14446.

The product of its digits is 31104, while the sum is 33.

The square root of 6663426 is about 2581.3612687882. The cubic root of 6663426 is about 188.1767049926.

It can be divided in two parts, 66 and 63426, that multiplied together give a square (4186116 = 2046²).

The spelling of 6663426 in words is "six million, six hundred sixty-three thousand, four hundred twenty-six".