19803205078 has 16 divisors (see below), whose sum is σ = 30178874880. Its totient is φ = 9744397416.

The previous prime is 19803205073. The next prime is 19803205099. The reversal of 19803205078 is 87050230891.

It is a super-2 number, since 2×19803205078² (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 (19803205073) 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, 155626 + ... + 252637.

It is an arithmetic number, because the mean of its divisors is an integer number (1886179680).

Almost surely, 2^19803205078 is an apocalyptic number.

19803205078 is a deficient number, since it is larger than the sum of its proper divisors (10375669802).

19803205078 is a wasteful number, since it uses less digits than its factorization.

19803205078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408651.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 19803205078 in words is "nineteen billion, eight hundred three million, two hundred five thousand, seventy-eight".