19118459591257 has 16 divisors (see below), whose sum is σ = 20606460089040. Its totient is φ = 17632939306752.

The previous prime is 19118459591249. The next prime is 19118459591299. The reversal of 19118459591257 is 75219595481191.

It can be written as a sum of positive squares in 8 ways, for example, as 3532103013321 + 15586356577936 = 1879389^2 + 3947956^2 .

It is a cyclic number.

It is not a de Polignac number, because 19118459591257 - 2³ = 19118459591249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19118459591192 and 19118459591201.

It is not an unprimeable number, because it can be changed into a prime (19118459591227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488531263 + ... + 488570395.

It is an arithmetic number, because the mean of its divisors is an integer number (1287903755565).

Almost surely, 2^{19118459591257} is an apocalyptic number.

It is an amenable number.

19118459591257 is a deficient number, since it is larger than the sum of its proper divisors (1488000497783).

19118459591257 is a wasteful number, since it uses less digits than its factorization.

19118459591257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69852.

The product of its digits is 40824000, while the sum is 67.

The spelling of 19118459591257 in words is "nineteen trillion, one hundred eighteen billion, four hundred fifty-nine million, five hundred ninety-one thousand, two hundred fifty-seven".