19877729759 has 4 divisors (see below), whose sum is σ = 20518946880. Its totient is φ = 19236512640.

The previous prime is 19877729747. The next prime is 19877729761. The reversal of 19877729759 is 95792777891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95792777891 = 691 ⋅138629201.

It is a cyclic number.

It is not a de Polignac number, because 19877729759 - 2²⁸ = 19609294303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19877729692 and 19877729701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19877729779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320608514 + ... + 320608575.

It is an arithmetic number, because the mean of its divisors is an integer number (5129736720).

Almost surely, 2^19877729759 is an apocalyptic number.

19877729759 is a deficient number, since it is larger than the sum of its proper divisors (641217121).

19877729759 is an equidigital number, since it uses as much as digits as its factorization.

19877729759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641217120.

The product of its digits is 140026320, while the sum is 71.

The spelling of 19877729759 in words is "nineteen billion, eight hundred seventy-seven million, seven hundred twenty-nine thousand, seven hundred fifty-nine".