1012005201605 has 8 divisors (see below), whose sum is σ = 1214424139032. Its totient is φ = 809592229888.

The previous prime is 1012005201587. The next prime is 1012005201607. The reversal of 1012005201605 is 5061025002101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 300507890596 + 711497311009 = 548186^2 + 843503^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1012005201605 - 2¹² = 1012005197509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012005201607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109324 + ... + 1804053.

It is an arithmetic number, because the mean of its divisors is an integer number (151803017379).

Almost surely, 2^{1012005201605} is an apocalyptic number.

It is an amenable number.

1012005201605 is a deficient number, since it is larger than the sum of its proper divisors (202418937427).

1012005201605 is an equidigital number, since it uses as much as digits as its factorization.

1012005201605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982855.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 1012005201605 in words is "one trillion, twelve billion, five million, two hundred one thousand, six hundred five".