19877019805 has 8 divisors (see below), whose sum is σ = 24359922432. Its totient is φ = 15563283408.

The previous prime is 19877019791. The next prime is 19877019847. The reversal of 19877019805 is 50891077891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19877019805 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42291297 + ... + 42291766.

It is an arithmetic number, because the mean of its divisors is an integer number (3044990304).

Almost surely, 2^19877019805 is an apocalyptic number.

It is an amenable number.

19877019805 is a deficient number, since it is larger than the sum of its proper divisors (4482902627).

19877019805 is an equidigital number, since it uses as much as digits as its factorization.

19877019805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84583115.

The product of its (nonzero) digits is 1270080, while the sum is 55.

The spelling of 19877019805 in words is "nineteen billion, eight hundred seventy-seven million, nineteen thousand, eight hundred five".