19998106155 has 24 divisors (see below), whose sum is σ = 34704764640. Its totient is φ = 10652924160.

The previous prime is 19998106153. The next prime is 19998106159. The reversal of 19998106155 is 55160189991.

19998106155 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 8 + 10 + 615 + 5 = 666.

It is not a de Polignac number, because 19998106155 - 2¹ = 19998106153 is a prime.

It is a super-3 number, since 3×19998106155³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19998106153) 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, 227086 + ... + 302595.

It is an arithmetic number, because the mean of its divisors is an integer number (1446031860).

Almost surely, 2^19998106155 is an apocalyptic number.

19998106155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19998106155 is a deficient number, since it is larger than the sum of its proper divisors (14706658485).

19998106155 is a wasteful number, since it uses less digits than its factorization.

19998106155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530531 (or 530528 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 54.

The spelling of 19998106155 in words is "nineteen billion, nine hundred ninety-eight million, one hundred six thousand, one hundred fifty-five".