19778444748 has 18 divisors (see below), whose sum is σ = 49995513204. Its totient is φ = 6592814904.

The previous prime is 19778444729. The next prime is 19778444771. The reversal of 19778444748 is 84744487791.

19778444748 is a `hidden beast` number, since 1 + 9 + 77 + 84 + 447 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 274700586 + ... + 274700657.

Almost surely, 2^19778444748 is an apocalyptic number.

19778444748 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19778444748 is an abundant number, since it is smaller than the sum of its proper divisors (30217068456).

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

19778444748 is a wasteful number, since it uses less digits than its factorization.

19778444748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549401253 (or 549401248 counting only the distinct ones).

The product of its digits is 50577408, while the sum is 63.

The spelling of 19778444748 in words is "nineteen billion, seven hundred seventy-eight million, four hundred forty-four thousand, seven hundred forty-eight".