1020566561326 has 16 divisors (see below), whose sum is σ = 1675633877568. Its totient is φ = 463308904800.

The previous prime is 1020566561321. The next prime is 1020566561327. The reversal of 1020566561326 is 6231656650201.

It is a super-2 number, since 2×1020566561326² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020566561321) 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, 321740710 + ... + 321743881.

It is an arithmetic number, because the mean of its divisors is an integer number (104727117348).

Almost surely, 2^{1020566561326} is an apocalyptic number.

1020566561326 is a deficient number, since it is larger than the sum of its proper divisors (655067316242).

1020566561326 is a wasteful number, since it uses less digits than its factorization.

1020566561326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643484667.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 1020566561326 in words is "one trillion, twenty billion, five hundred sixty-six million, five hundred sixty-one thousand, three hundred twenty-six".