663426426 has 16 divisors (see below), whose sum is σ = 1428918624. Its totient is φ = 204131184.

The previous prime is 663426389. The next prime is 663426427. The reversal of 663426426 is 624624366.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (663426427) 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, 4252656 + ... + 4252811.

It is an arithmetic number, because the mean of its divisors is an integer number (89307414).

Almost surely, 2^663426426 is an apocalyptic number.

663426426 is an abundant number, since it is smaller than the sum of its proper divisors (765492198).

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

663426426 is a wasteful number, since it uses less digits than its factorization.

663426426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8505485.

The product of its digits is 248832, while the sum is 39.

The square root of 663426426 is about 25757.0655549113. The cubic root of 663426426 is about 872.1628600858.

The spelling of 663426426 in words is "six hundred sixty-three million, four hundred twenty-six thousand, four hundred twenty-six".