62661745681 has 2 divisors, whose sum is σ = 62661745682. Its totient is φ = 62661745680.

The previous prime is 62661745661. The next prime is 62661745687. The reversal of 62661745681 is 18654716626.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61508464081 + 1153281600 = 248009^2 + 33960^2 .

It is a cyclic number.

It is not a de Polignac number, because 62661745681 - 2⁵ = 62661745649 is a prime.

It is a super-2 number, since 2×62661745681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (62661745687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31330872840 + 31330872841.

It is an arithmetic number, because the mean of its divisors is an integer number (31330872841).

Almost surely, 2^62661745681 is an apocalyptic number.

It is an amenable number.

62661745681 is a deficient number, since it is larger than the sum of its proper divisors (1).

62661745681 is an equidigital number, since it uses as much as digits as its factorization.

62661745681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 52.

The spelling of 62661745681 in words is "sixty-two billion, six hundred sixty-one million, seven hundred forty-five thousand, six hundred eighty-one".