63992778494845 has 16 divisors (see below), whose sum is σ = 79440260175360. Its totient is φ = 49428314316864.

The previous prime is 63992778494839. The next prime is 63992778494867. The reversal of 63992778494845 is 54849487729936.

It is a de Polignac number, because none of the positive numbers 2^k-63992778494845 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9744214 + ... + 14931016.

It is an arithmetic number, because the mean of its divisors is an integer number (4965016260960).

Almost surely, 2^{63992778494845} is an apocalyptic number.

It is an amenable number.

63992778494845 is a deficient number, since it is larger than the sum of its proper divisors (15447481680515).

63992778494845 is a wasteful number, since it uses less digits than its factorization.

63992778494845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5271924.

The product of its digits is 26336378880, while the sum is 85.

The spelling of 63992778494845 in words is "sixty-three trillion, nine hundred ninety-two billion, seven hundred seventy-eight million, four hundred ninety-four thousand, eight hundred forty-five".