63121780813 has 64 divisors (see below), whose sum is σ = 80493557760. Its totient is φ = 48173190912.

The previous prime is 63121780783. The next prime is 63121780879. The reversal of 63121780813 is 31808712136.

It is not a de Polignac number, because 63121780813 - 2⁵ = 63121780781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63121780913) 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 in 63 ways as a sum of consecutive naturals, for example, 158996731 + ... + 158997127.

It is an arithmetic number, because the mean of its divisors is an integer number (1257711840).

Almost surely, 2^63121780813 is an apocalyptic number.

It is an amenable number.

63121780813 is a deficient number, since it is larger than the sum of its proper divisors (17371776947).

63121780813 is a wasteful number, since it uses less digits than its factorization.

63121780813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 63121780813 in words is "sixty-three billion, one hundred twenty-one million, seven hundred eighty thousand, eight hundred thirteen".