19055869849 has 27 divisors (see below), whose sum is σ = 20296472157. Its totient is φ = 17890372800.

The previous prime is 19055869841. The next prime is 19055869883. The reversal of 19055869849 is 94896855091.

The square root of 19055869849 is 138043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4973775625 + 14082094224 = 70525^2 + 118668^2 .

It is not a de Polignac number, because 19055869849 - 2³ = 19055869841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19055869841) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 261039277 + ... + 261039349.

It is an arithmetic number, because the mean of its divisors is an integer number (751721191).

Almost surely, 2^19055869849 is an apocalyptic number.

19055869849 is the 138043-rd square number.

19055869849 is the 69022-nd centered octagonal number.

It is an amenable number.

19055869849 is a deficient number, since it is larger than the sum of its proper divisors (1240602308).

19055869849 is an frugal number, since it uses more digits than its factorization.

19055869849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 64.

Multiplying 19055869849 by its sum of digits (64), we get a square (1219575670336 = 1104344²).

The spelling of 19055869849 in words is "nineteen billion, fifty-five million, eight hundred sixty-nine thousand, eight hundred forty-nine".