19018058961 has 24 divisors (see below), whose sum is σ = 27900250560. Its totient is φ = 11514495520.

The previous prime is 19018058959. The next prime is 19018058971. The reversal of 19018058961 is 16985081091.

It is not a de Polignac number, because 19018058961 - 2¹ = 19018058959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19018058961.

It is not an unprimeable number, because it can be changed into a prime (19018058971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 341860 + ... + 393578.

It is an arithmetic number, because the mean of its divisors is an integer number (1162510440).

Almost surely, 2^19018058961 is an apocalyptic number.

19018058961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19018058961 is a deficient number, since it is larger than the sum of its proper divisors (8882191599).

19018058961 is a wasteful number, since it uses less digits than its factorization.

19018058961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52757 (or 52746 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 48.

The spelling of 19018058961 in words is "nineteen billion, eighteen million, fifty-eight thousand, nine hundred sixty-one".