63551761635561 has 16 divisors (see below), whose sum is σ = 86936567614848. Its totient is φ = 41270592694400.

The previous prime is 63551761635533. The next prime is 63551761635569. The reversal of 63551761635561 is 16553616715536.

It is a cyclic number.

It is not a de Polignac number, because 63551761635561 - 2³³ = 63543171700969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63551761635495 and 63551761635504.

It is not an unprimeable number, because it can be changed into a prime (63551761635569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399210210 + ... + 399369371.

It is an arithmetic number, because the mean of its divisors is an integer number (5433535475928).

Almost surely, 2^{63551761635561} is an apocalyptic number.

It is an amenable number.

63551761635561 is a deficient number, since it is larger than the sum of its proper divisors (23384805979287).

63551761635561 is a wasteful number, since it uses less digits than its factorization.

63551761635561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798580272.

The product of its digits is 51030000, while the sum is 60.

The spelling of 63551761635561 in words is "sixty-three trillion, five hundred fifty-one billion, seven hundred sixty-one million, six hundred thirty-five thousand, five hundred sixty-one".