1011206920985 has 8 divisors (see below), whose sum is σ = 1214055952776. Its totient is φ = 808560438400.

The previous prime is 1011206920963. The next prime is 1011206920991. The reversal of 1011206920985 is 5890296021101.

It can be written as a sum of positive squares in 4 ways, for example, as 119708388121 + 891498532864 = 345989^2 + 944192^2 .

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

It is not a de Polignac number, because 1011206920985 - 2¹⁴ = 1011206904601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50626316 + ... + 50646285.

It is an arithmetic number, because the mean of its divisors is an integer number (151756994097).

Almost surely, 2^{1011206920985} is an apocalyptic number.

It is an amenable number.

1011206920985 is a deficient number, since it is larger than the sum of its proper divisors (202849031791).

1011206920985 is a wasteful number, since it uses less digits than its factorization.

1011206920985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101274603.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 1011206920985 in words is "one trillion, eleven billion, two hundred six million, nine hundred twenty thousand, nine hundred eighty-five".