19678792650 has 144 divisors (see below), whose sum is σ = 54150096672. Its totient is φ = 4725564800.

The previous prime is 19678792649. The next prime is 19678792691. The reversal of 19678792650 is 5629787691.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1936984 + ... + 1947116.

It is an arithmetic number, because the mean of its divisors is an integer number (376042338).

Almost surely, 2^19678792650 is an apocalyptic number.

19678792650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19678792650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27075048336).

19678792650 is an abundant number, since it is smaller than the sum of its proper divisors (34471304022).

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

19678792650 is a wasteful number, since it uses less digits than its factorization.

19678792650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10277 (or 10261 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 60.

The spelling of 19678792650 in words is "nineteen billion, six hundred seventy-eight million, seven hundred ninety-two thousand, six hundred fifty".