63660144649 has 2 divisors, whose sum is σ = 63660144650. Its totient is φ = 63660144648.

The previous prime is 63660144623. The next prime is 63660144679. The reversal of 63660144649 is 94644106636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47102889024 + 16557255625 = 217032^2 + 128675^2 .

It is a cyclic number.

It is not a de Polignac number, because 63660144649 - 2¹³ = 63660136457 is a prime.

It is a super-2 number, since 2×63660144649² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63660144619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31830072324 + 31830072325.

It is an arithmetic number, because the mean of its divisors is an integer number (31830072325).

Almost surely, 2^63660144649 is an apocalyptic number.

It is an amenable number.

63660144649 is a deficient number, since it is larger than the sum of its proper divisors (1).

63660144649 is an equidigital number, since it uses as much as digits as its factorization.

63660144649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 49.

The spelling of 63660144649 in words is "sixty-three billion, six hundred sixty million, one hundred forty-four thousand, six hundred forty-nine".