63616669081 has 6 divisors (see below), whose sum is σ = 74003064090. Its totient is φ = 54528573456.

The previous prime is 63616669037. The next prime is 63616669099. The reversal of 63616669081 is 18096661636.

It can be written as a sum of positive squares in only one way, i.e., 62397542025 + 1219127056 = 249795^2 + 34916^2 .

It is not a de Polignac number, because 63616669081 - 2¹¹ = 63616667033 is a prime.

It is a super-2 number, since 2×63616669081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63616669001) 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, 649149636 + ... + 649149733.

It is an arithmetic number, because the mean of its divisors is an integer number (12333844015).

Almost surely, 2^63616669081 is an apocalyptic number.

It is an amenable number.

63616669081 is a deficient number, since it is larger than the sum of its proper divisors (10386395009).

63616669081 is a wasteful number, since it uses less digits than its factorization.

63616669081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298299383 (or 1298299376 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 63616669081 in words is "sixty-three billion, six hundred sixteen million, six hundred sixty-nine thousand, eighty-one".