7182378802661 has 2 divisors, whose sum is σ = 7182378802662. Its totient is φ = 7182378802660.

The previous prime is 7182378802579. The next prime is 7182378802663. The reversal of 7182378802661 is 1662088732817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6866443752100 + 315935050561 = 2620390^2 + 562081^2 .

It is an emirp because it is prime and its reverse (1662088732817) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7182378802661 is a prime.

It is a Sophie Germain prime.

Together with 7182378802663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7182378802661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7182378802663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3591189401330 + 3591189401331.

It is an arithmetic number, because the mean of its divisors is an integer number (3591189401331).

Almost surely, 2^{7182378802661} is an apocalyptic number.

It is an amenable number.

7182378802661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7182378802661 is an equidigital number, since it uses as much as digits as its factorization.

7182378802661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10838016, while the sum is 59.

The spelling of 7182378802661 in words is "seven trillion, one hundred eighty-two billion, three hundred seventy-eight million, eight hundred two thousand, six hundred sixty-one".