2061720715605 has 32 divisors (see below), whose sum is σ = 3302449920000. Its totient is φ = 1098352748352.

The previous prime is 2061720715603. The next prime is 2061720715697. The reversal of 2061720715605 is 5065170271602.

It is a happy number.

It is not a de Polignac number, because 2061720715605 - 2¹ = 2061720715603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061720715603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59317842 + ... + 59352588.

It is an arithmetic number, because the mean of its divisors is an integer number (103201560000).

Almost surely, 2^{2061720715605} is an apocalyptic number.

It is an amenable number.

2061720715605 is a deficient number, since it is larger than the sum of its proper divisors (1240729204395).

2061720715605 is a wasteful number, since it uses less digits than its factorization.

2061720715605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39073.

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 2061720715605 in words is "two trillion, sixty-one billion, seven hundred twenty million, seven hundred fifteen thousand, six hundred five".