19027940557 has 4 divisors (see below), whose sum is σ = 20147231196. Its totient is φ = 17908649920.

The previous prime is 19027940497. The next prime is 19027940563. The reversal of 19027940557 is 75504972091.

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 12502370596 + 6525569961 = 111814^2 + 80781^2 .

It is a cyclic number.

It is not a de Polignac number, because 19027940557 - 2¹⁹ = 19027416269 is a prime.

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 19027940557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19027940587) 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, 559645294 + ... + 559645327.

It is an arithmetic number, because the mean of its divisors is an integer number (5036807799).

Almost surely, 2^19027940557 is an apocalyptic number.

19027940557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19027940557 is a deficient number, since it is larger than the sum of its proper divisors (1119290639).

19027940557 is a wasteful number, since it uses less digits than its factorization.

19027940557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119290638.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 19027940557 in words is "nineteen billion, twenty-seven million, nine hundred forty thousand, five hundred fifty-seven".