19012550357 has 4 divisors (see below), whose sum is σ = 19013653740. Its totient is φ = 19011446976.

The previous prime is 19012550353. The next prime is 19012550371. The reversal of 19012550357 is 75305521091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75305521091 = 122041 ⋅617051.

It can be written as a sum of positive squares in 2 ways, for example, as 5410926481 + 13601623876 = 73559^2 + 116626^2 .

It is a cyclic number.

It is not a de Polignac number, because 19012550357 - 2² = 19012550353 is a prime.

It is a super-2 number, since 2×19012550357² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19012550357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19012550351) 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, 525428 + ... + 560445.

It is an arithmetic number, because the mean of its divisors is an integer number (4753413435).

Almost surely, 2^19012550357 is an apocalyptic number.

It is an amenable number.

19012550357 is a deficient number, since it is larger than the sum of its proper divisors (1103383).

19012550357 is a wasteful number, since it uses less digits than its factorization.

19012550357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103382.

The product of its (nonzero) digits is 47250, while the sum is 38.

The spelling of 19012550357 in words is "nineteen billion, twelve million, five hundred fifty thousand, three hundred fifty-seven".