1020716661661 has 16 divisors (see below), whose sum is σ = 1052523808128. Its totient is φ = 989416792000.

The previous prime is 1020716661631. The next prime is 1020716661689. The reversal of 1020716661661 is 1661666170201.

It is a cyclic number.

It is not a de Polignac number, because 1020716661661 - 2¹³ = 1020716653469 is a prime.

It is a super-3 number, since 3×1020716661661³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020716661631) 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, 2295696 + ... + 2704006.

It is an arithmetic number, because the mean of its divisors is an integer number (65782738008).

Almost surely, 2^{1020716661661} is an apocalyptic number.

It is an amenable number.

1020716661661 is a deficient number, since it is larger than the sum of its proper divisors (31807146467).

1020716661661 is a wasteful number, since it uses less digits than its factorization.

1020716661661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408932.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 1020716661661 in words is "one trillion, twenty billion, seven hundred sixteen million, six hundred sixty-one thousand, six hundred sixty-one".