62661765681 has 6 divisors (see below), whose sum is σ = 90511439330. Its totient is φ = 41774510448.

The previous prime is 62661765667. The next prime is 62661765701. The reversal of 62661765681 is 18656716626.

62661765681 is a `hidden beast` number, since 6 + 2 + 6 + 6 + 1 + 76 + 568 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46042430625 + 16619335056 = 214575^2 + 128916^2 .

It is not a de Polignac number, because 62661765681 - 2¹³ = 62661757489 is a prime.

It is a super-2 number, since 2×62661765681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (62661745681) 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, 3481209196 + ... + 3481209213.

Almost surely, 2^62661765681 is an apocalyptic number.

It is an amenable number.

62661765681 is a deficient number, since it is larger than the sum of its proper divisors (27849673649).

62661765681 is a wasteful number, since it uses less digits than its factorization.

62661765681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962418415 (or 6962418412 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 62661765681 in words is "sixty-two billion, six hundred sixty-one million, seven hundred sixty-five thousand, six hundred eighty-one".