663497842818 has 16 divisors (see below), whose sum is σ = 1332041299776. Its totient is φ = 220325011920.

The previous prime is 663497842817. The next prime is 663497842829. The reversal of 663497842818 is 818248794366.

It is a happy number.

It is a super-2 number, since 2×663497842818² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663497842817) 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, 210232213 + ... + 210235368.

It is an arithmetic number, because the mean of its divisors is an integer number (83252581236).

Almost surely, 2^663497842818 is an apocalyptic number.

663497842818 is an abundant number, since it is smaller than the sum of its proper divisors (668543456958).

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

663497842818 is a wasteful number, since it uses less digits than its factorization.

663497842818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420467849.

The product of its digits is 111476736, while the sum is 66.

The spelling of 663497842818 in words is "six hundred sixty-three billion, four hundred ninety-seven million, eight hundred forty-two thousand, eight hundred eighteen".