63780801660 has 36 divisors (see below), whose sum is σ = 193468432248. Its totient is φ = 17008213728.

The previous prime is 63780801631. The next prime is 63780801673. The reversal of 63780801660 is 6610808736.

63780801660 is a `hidden beast` number, since 637 + 8 + 0 + 8 + 0 + 1 + 6 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177168714 + ... + 177169073.

It is an arithmetic number, because the mean of its divisors is an integer number (5374123118).

Almost surely, 2^63780801660 is an apocalyptic number.

63780801660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63780801660 is an abundant number, since it is smaller than the sum of its proper divisors (129687630588).

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

63780801660 is a wasteful number, since it uses less digits than its factorization.

63780801660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354337802 (or 354337797 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 63780801660 in words is "sixty-three billion, seven hundred eighty million, eight hundred one thousand, six hundred sixty".