78863648651 has 2 divisors, whose sum is σ = 78863648652. Its totient is φ = 78863648650.

The previous prime is 78863648629. The next prime is 78863648657. The reversal of 78863648651 is 15684636887.

It is a strong prime.

It is an emirp because it is prime and its reverse (15684636887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78863648651 - 2²² = 78859454347 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (78863648657) 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, 39431824325 + 39431824326.

It is an arithmetic number, because the mean of its divisors is an integer number (39431824326).

Almost surely, 2^78863648651 is an apocalyptic number.

78863648651 is a deficient number, since it is larger than the sum of its proper divisors (1).

78863648651 is an equidigital number, since it uses as much as digits as its factorization.

78863648651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46448640, while the sum is 62.

The spelling of 78863648651 in words is "seventy-eight billion, eight hundred sixty-three million, six hundred forty-eight thousand, six hundred fifty-one".