1999999999955 has 8 divisors (see below), whose sum is σ = 2400014695104. Its totient is φ = 1599990203200.

The previous prime is 1999999999927. The next prime is 1999999999981. The reversal of 1999999999955 is 5599999999991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1999999999955 - 2¹² = 1999999995859 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256811 + ... + 2016420.

It is an arithmetic number, because the mean of its divisors is an integer number (300001836888).

Almost surely, 2^{1999999999955} is an apocalyptic number.

1999999999955 is a deficient number, since it is larger than the sum of its proper divisors (400014695149).

1999999999955 is a wasteful number, since it uses less digits than its factorization.

1999999999955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449197.

The product of its digits is 87169610025, while the sum is 101.

The spelling of 1999999999955 in words is "one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-five".