19158719137 has 4 divisors (see below), whose sum is σ = 19264568596. Its totient is φ = 19052869680.

The previous prime is 19158719119. The next prime is 19158719161. The reversal of 19158719137 is 73191785191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5409749601 + 13748969536 = 73551^2 + 117256^2 .

It is a cyclic number.

It is not a de Polignac number, because 19158719137 - 2¹⁵ = 19158686369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19158719117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52924458 + ... + 52924819.

It is an arithmetic number, because the mean of its divisors is an integer number (4816142149).

Almost surely, 2^19158719137 is an apocalyptic number.

It is an amenable number.

19158719137 is a deficient number, since it is larger than the sum of its proper divisors (105849459).

19158719137 is a wasteful number, since it uses less digits than its factorization.

19158719137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105849458.

The product of its digits is 476280, while the sum is 52.

The spelling of 19158719137 in words is "nineteen billion, one hundred fifty-eight million, seven hundred nineteen thousand, one hundred thirty-seven".