63557875620 has 36 divisors (see below), whose sum is σ = 192792223260. Its totient is φ = 16948766784.

The previous prime is 63557875583. The next prime is 63557875621. The reversal of 63557875620 is 2657875536.

63557875620 is a `hidden beast` number, since 6 + 3 + 5 + 5 + 7 + 8 + 7 + 5 + 620 = 666.

63557875620 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 7283598336 + 56274277284 = 85344^2 + 237222^2 .

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

It is not an unprimeable number, because it can be changed into a prime (63557875621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176549475 + ... + 176549834.

It is an arithmetic number, because the mean of its divisors is an integer number (5355339535).

Almost surely, 2^63557875620 is an apocalyptic number.

63557875620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63557875620 is an abundant number, since it is smaller than the sum of its proper divisors (129234347640).

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

63557875620 is a wasteful number, since it uses less digits than its factorization.

63557875620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353099324 (or 353099319 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 54.

The spelling of 63557875620 in words is "sixty-three billion, five hundred fifty-seven million, eight hundred seventy-five thousand, six hundred twenty".