7758920321 has 2 divisors, whose sum is σ = 7758920322. Its totient is φ = 7758920320.

The previous prime is 7758920291. The next prime is 7758920363. The reversal of 7758920321 is 1230298577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6451302400 + 1307617921 = 80320^2 + 36161^2 .

It is a cyclic number.

It is not a de Polignac number, because 7758920321 - 2¹⁰ = 7758919297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7758920381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3879460160 + 3879460161.

It is an arithmetic number, because the mean of its divisors is an integer number (3879460161).

Almost surely, 2^7758920321 is an apocalyptic number.

It is an amenable number.

7758920321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7758920321 is an equidigital number, since it uses as much as digits as its factorization.

7758920321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 7758920321 is about 88084.7337567640. The cubic root of 7758920321 is about 1979.7047753043.

The spelling of 7758920321 in words is "seven billion, seven hundred fifty-eight million, nine hundred twenty thousand, three hundred twenty-one".