19128485377 has 4 divisors (see below), whose sum is σ = 19397900736. Its totient is φ = 18859070020.

The previous prime is 19128485309. The next prime is 19128485381. The reversal of 19128485377 is 77358482191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77358482191 = 47 ⋅1645925153.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19128485377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19128485177) 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, 134707573 + ... + 134707714.

It is an arithmetic number, because the mean of its divisors is an integer number (4849475184).

Almost surely, 2^19128485377 is an apocalyptic number.

It is an amenable number.

19128485377 is a deficient number, since it is larger than the sum of its proper divisors (269415359).

19128485377 is an equidigital number, since it uses as much as digits as its factorization.

19128485377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269415358.

The product of its digits is 3386880, while the sum is 55.

It can be divided in two parts, 1912848 and 5377, that added together give a square (1918225 = 1385²).

The spelling of 19128485377 in words is "nineteen billion, one hundred twenty-eight million, four hundred eighty-five thousand, three hundred seventy-seven".