1605721010061 has 16 divisors (see below), whose sum is σ = 2448329952384. Its totient is φ = 916985993664.

The previous prime is 1605721010041. The next prime is 1605721010077. The reversal of 1605721010061 is 1600101275061.

It is not a de Polignac number, because 1605721010061 - 2¹⁹ = 1605720485773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605721010041) 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, 23668206 + ... + 23735951.

It is an arithmetic number, because the mean of its divisors is an integer number (153020622024).

Almost surely, 2^{1605721010061} is an apocalyptic number.

It is an amenable number.

1605721010061 is a deficient number, since it is larger than the sum of its proper divisors (842608942323).

1605721010061 is a wasteful number, since it uses less digits than its factorization.

1605721010061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47405780.

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 1605721010061 in words is "one trillion, six hundred five billion, seven hundred twenty-one million, ten thousand, sixty-one".