63655831620 has 72 divisors (see below), whose sum is σ = 193512120984. Its totient is φ = 16937722368.

The previous prime is 63655831553. The next prime is 63655831621. The reversal of 63655831620 is 2613855636.

63655831620 is a `hidden beast` number, since 6 + 3 + 6 + 5 + 583 + 1 + 62 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 24963368004 + 38692463616 = 157998^2 + 196704^2 .

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

It is not an unprimeable number, because it can be changed into a prime (63655831621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304659 + ... + 469178.

It is an arithmetic number, because the mean of its divisors is an integer number (2687668347).

Almost surely, 2^63655831620 is an apocalyptic number.

63655831620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63655831620 is an abundant number, since it is smaller than the sum of its proper divisors (129856289364).

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

63655831620 is a wasteful number, since it uses less digits than its factorization.

63655831620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774309 (or 774304 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 63655831620 in words is "sixty-three billion, six hundred fifty-five million, eight hundred thirty-one thousand, six hundred twenty".