63998939618 has 8 divisors (see below), whose sum is σ = 97431221712. Its totient is φ = 31521865716.

The previous prime is 63998939573. The next prime is 63998939657. The reversal of 63998939618 is 81693989936.

63998939618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238801880 + ... + 238802147.

It is an arithmetic number, because the mean of its divisors is an integer number (12178902714).

Almost surely, 2^63998939618 is an apocalyptic number.

63998939618 is a deficient number, since it is larger than the sum of its proper divisors (33432282094).

63998939618 is a wasteful number, since it uses less digits than its factorization.

63998939618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477604096.

The product of its digits is 136048896, while the sum is 71.

The spelling of 63998939618 in words is "sixty-three billion, nine hundred ninety-eight million, nine hundred thirty-nine thousand, six hundred eighteen".