663786363620 has 12 divisors (see below), whose sum is σ = 1393951363644. Its totient is φ = 265514545440.

The previous prime is 663786363613. The next prime is 663786363659. The reversal of 663786363620 is 26363687366.

It can be written as a sum of positive squares in 2 ways, for example, as 518984804836 + 144801558784 = 720406^2 + 380528^2 .

It is a super-2 number, since 2×663786363620² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16594659071 + ... + 16594659110.

It is an arithmetic number, because the mean of its divisors is an integer number (116162613637).

Almost surely, 2^663786363620 is an apocalyptic number.

It is an amenable number.

663786363620 is an abundant number, since it is smaller than the sum of its proper divisors (730165000024).

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

663786363620 is a wasteful number, since it uses less digits than its factorization.

663786363620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33189318190 (or 33189318188 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 56.

The spelling of 663786363620 in words is "six hundred sixty-three billion, seven hundred eighty-six million, three hundred sixty-three thousand, six hundred twenty".