63544400077 has 2 divisors, whose sum is σ = 63544400078. Its totient is φ = 63544400076.

The previous prime is 63544399987. The next prime is 63544400123. The reversal of 63544400077 is 77000444536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62950308201 + 594091876 = 250899^2 + 24374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63544400077 is a prime.

It is a super-2 number, since 2×63544400077² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63544400477) 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, 31772200038 + 31772200039.

It is an arithmetic number, because the mean of its divisors is an integer number (31772200039).

Almost surely, 2^63544400077 is an apocalyptic number.

It is an amenable number.

63544400077 is a deficient number, since it is larger than the sum of its proper divisors (1).

63544400077 is an equidigital number, since it uses as much as digits as its factorization.

63544400077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 40.

The spelling of 63544400077 in words is "sixty-three billion, five hundred forty-four million, four hundred thousand, seventy-seven".