63910721949 has 16 divisors (see below), whose sum is σ = 85333612800. Its totient is φ = 42547530816.

The previous prime is 63910721947. The next prime is 63910722049. The reversal of 63910721949 is 94912701936.

63910721949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63910721949 - 2¹ = 63910721947 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63910721947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10942572 + ... + 10948410.

It is an arithmetic number, because the mean of its divisors is an integer number (5333350800).

Almost surely, 2^63910721949 is an apocalyptic number.

It is an amenable number.

63910721949 is a deficient number, since it is larger than the sum of its proper divisors (21422890851).

63910721949 is a wasteful number, since it uses less digits than its factorization.

63910721949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324.

The product of its (nonzero) digits is 734832, while the sum is 51.

The spelling of 63910721949 in words is "sixty-three billion, nine hundred ten million, seven hundred twenty-one thousand, nine hundred forty-nine".