19691010855 has 24 divisors (see below), whose sum is σ = 34924835088. Its totient is φ = 10257641856.

The previous prime is 19691010853. The next prime is 19691010881. The reversal of 19691010855 is 55801019691.

It is not a de Polignac number, because 19691010855 - 2¹ = 19691010853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19691010855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19691010853) 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, 5086182 + ... + 5090051.

It is an arithmetic number, because the mean of its divisors is an integer number (1455201462).

Almost surely, 2^19691010855 is an apocalyptic number.

19691010855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19691010855 is a deficient number, since it is larger than the sum of its proper divisors (15233824233).

19691010855 is a wasteful number, since it uses less digits than its factorization.

19691010855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10176287 (or 10176284 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 45.

The spelling of 19691010855 in words is "nineteen billion, six hundred ninety-one million, ten thousand, eight hundred fifty-five".