1011999999945 has 32 divisors (see below), whose sum is σ = 1766502180864. Its totient is φ = 490638283200.

The previous prime is 1011999999943. The next prime is 1011999999949. The reversal of 1011999999945 is 5499999991101.

It is not a de Polignac number, because 1011999999945 - 2¹ = 1011999999943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011999999943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2838510 + ... + 3175080.

It is an arithmetic number, because the mean of its divisors is an integer number (55203193152).

Almost surely, 2^{1011999999945} is an apocalyptic number.

1011999999945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1011999999945 is a deficient number, since it is larger than the sum of its proper divisors (754502180919).

1011999999945 is a wasteful number, since it uses less digits than its factorization.

1011999999945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354813.

The product of its (nonzero) digits is 95659380, while the sum is 75.

The spelling of 1011999999945 in words is "one trillion, eleven billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-five".