63910721896 has 32 divisors (see below), whose sum is σ = 140652944640. Its totient is φ = 26650029888.

The previous prime is 63910721879. The next prime is 63910721899. The reversal of 63910721896 is 69812701936.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (63910721899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15420400 + ... + 15424543.

It is an arithmetic number, because the mean of its divisors is an integer number (4395404520).

Almost surely, 2^63910721896 is an apocalyptic number.

It is an amenable number.

63910721896 is an abundant number, since it is smaller than the sum of its proper divisors (76742222744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63910721896 is a wasteful number, since it uses less digits than its factorization.

63910721896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30844993 (or 30844989 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 63910721896 in words is "sixty-three billion, nine hundred ten million, seven hundred twenty-one thousand, eight hundred ninety-six".