19999999999955 has 16 divisors (see below), whose sum is σ = 25263410526720. Its totient is φ = 15157743157728.

The previous prime is 19999999999949. The next prime is 19999999999957. The reversal of 19999999999955 is 55999999999991.

It is a cyclic number.

It is not a de Polignac number, because 19999999999955 - 2⁸ = 19999999999699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19999999999957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8999984 + ... + 10999986.

It is an arithmetic number, because the mean of its divisors is an integer number (1578963157920).

Almost surely, 2^{19999999999955} is an apocalyptic number.

19999999999955 is a deficient number, since it is larger than the sum of its proper divisors (5263410526765).

19999999999955 is a wasteful number, since it uses less digits than its factorization.

19999999999955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105290.

The product of its digits is 784526490225, while the sum is 110.

The spelling of 19999999999955 in words is "nineteen trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-five".