65478561984 has 84 divisors (see below), whose sum is σ = 204744538440. Its totient is φ = 19841986560.

The previous prime is 65478561979. The next prime is 65478562001. The reversal of 65478561984 is 48916587456.

65478561984 is a `hidden beast` number, since 6 + 5 + 4 + 7 + 8 + 5 + 619 + 8 + 4 = 666.

65478561984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5160849 + ... + 5173520.

Almost surely, 2^65478561984 is an apocalyptic number.

65478561984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

65478561984 is an abundant number, since it is smaller than the sum of its proper divisors (139265976456).

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

65478561984 is a wasteful number, since it uses less digits than its factorization.

65478561984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10334398 (or 10334385 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 63.

The spelling of 65478561984 in words is "sixty-five billion, four hundred seventy-eight million, five hundred sixty-one thousand, nine hundred eighty-four".