19778542848 has 72 divisors (see below), whose sum is σ = 58488651200. Its totient is φ = 6592845312.

The previous prime is 19778542843. The next prime is 19778542897. The reversal of 19778542848 is 84824587791.

19778542848 is a `hidden beast` number, since 1 + 9 + 7 + 7 + 8 + 542 + 84 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×19778542848² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19778542843) 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, 1423828 + ... + 1437651.

Almost surely, 2^19778542848 is an apocalyptic number.

19778542848 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19778542848 is an abundant number, since it is smaller than the sum of its proper divisors (38710108352).

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

19778542848 is an equidigital number, since it uses as much as digits as its factorization.

19778542848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2861504 (or 2861484 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The spelling of 19778542848 in words is "nineteen billion, seven hundred seventy-eight million, five hundred forty-two thousand, eight hundred forty-eight".