63349018640 has 20 divisors (see below), whose sum is σ = 147286468524. Its totient is φ = 25339607424.

The previous prime is 63349018633. The next prime is 63349018693. The reversal of 63349018640 is 4681094336.

63349018640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 42614170624 + 20734848016 = 206432^2 + 143996^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 63349018591 and 63349018600.

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, 395931287 + ... + 395931446.

Almost surely, 2^63349018640 is an apocalyptic number.

It is an amenable number.

63349018640 is an abundant number, since it is smaller than the sum of its proper divisors (83937449884).

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

63349018640 is a wasteful number, since it uses less digits than its factorization.

63349018640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791862746 (or 791862740 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 63349018640 in words is "sixty-three billion, three hundred forty-nine million, eighteen thousand, six hundred forty".