63557510661 has 6 divisors (see below), whose sum is σ = 91805293190. Its totient is φ = 42371673768.

The previous prime is 63557510657. The next prime is 63557510699. The reversal of 63557510661 is 16601575536.

63557510661 is a `hidden beast` number, since 6 + 3 + 5 + 575 + 10 + 6 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41414285025 + 22143225636 = 203505^2 + 148806^2 .

It is not a de Polignac number, because 63557510661 - 2² = 63557510657 is a prime.

It is a super-2 number, since 2×63557510661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63557510651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3530972806 + ... + 3530972823.

Almost surely, 2^63557510661 is an apocalyptic number.

It is an amenable number.

63557510661 is a deficient number, since it is larger than the sum of its proper divisors (28247782529).

63557510661 is a wasteful number, since it uses less digits than its factorization.

63557510661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7061945635 (or 7061945632 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 63557510661 in words is "sixty-three billion, five hundred fifty-seven million, five hundred ten thousand, six hundred sixty-one".