19778366470248 has 72 divisors (see below), whose sum is σ = 54841110481170. Its totient is φ = 6439468109760.

The previous prime is 19778366470229. The next prime is 19778366470259. The reversal of 19778366470248 is 84207466387791.

19778366470248 is a `hidden beast` number, since 1 + 9 + 7 + 78 + 3 + 66 + 470 + 24 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16259298127524 + 3519068342724 = 4032282^2 + 1875918^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 74150143 + ... + 74416398.

Almost surely, 2^{19778366470248} is an apocalyptic number.

19778366470248 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19778366470248 is an abundant number, since it is smaller than the sum of its proper divisors (35062744010922).

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

19778366470248 is a wasteful number, since it uses less digits than its factorization.

19778366470248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148566639 (or 148566589 counting only the distinct ones).

The product of its (nonzero) digits is 682795008, while the sum is 72.

The spelling of 19778366470248 in words is "nineteen trillion, seven hundred seventy-eight billion, three hundred sixty-six million, four hundred seventy thousand, two hundred forty-eight".