7829650971661 has 2 divisors, whose sum is σ = 7829650971662. Its totient is φ = 7829650971660.

The previous prime is 7829650971641. The next prime is 7829650971683. The reversal of 7829650971661 is 1661790569287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5911190514436 + 1918460457225 = 2431294^2 + 1385085^2 .

It is a cyclic number.

It is not a de Polignac number, because 7829650971661 - 2²³ = 7829642583053 is a prime.

It is a super-3 number, since 3×7829650971661³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7829650971601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3914825485830 + 3914825485831.

It is an arithmetic number, because the mean of its divisors is an integer number (3914825485831).

Almost surely, 2^{7829650971661} is an apocalyptic number.

It is an amenable number.

7829650971661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7829650971661 is an equidigital number, since it uses as much as digits as its factorization.

7829650971661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68584320, while the sum is 67.

The spelling of 7829650971661 in words is "seven trillion, eight hundred twenty-nine billion, six hundred fifty million, nine hundred seventy-one thousand, six hundred sixty-one".