78632461549 has 2 divisors, whose sum is σ = 78632461550. Its totient is φ = 78632461548.

The previous prime is 78632461541. The next prime is 78632461553. The reversal of 78632461549 is 94516423687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50335166025 + 28297295524 = 224355^2 + 168218^2 .

It is a cyclic number.

It is not a de Polignac number, because 78632461549 - 2³ = 78632461541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78632461549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78632461541) 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, 39316230774 + 39316230775.

It is an arithmetic number, because the mean of its divisors is an integer number (39316230775).

Almost surely, 2^78632461549 is an apocalyptic number.

It is an amenable number.

78632461549 is a deficient number, since it is larger than the sum of its proper divisors (1).

78632461549 is an equidigital number, since it uses as much as digits as its factorization.

78632461549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 55.

The spelling of 78632461549 in words is "seventy-eight billion, six hundred thirty-two million, four hundred sixty-one thousand, five hundred forty-nine".