783980920909 has 2 divisors, whose sum is σ = 783980920910. Its totient is φ = 783980920908.

The previous prime is 783980920907. The next prime is 783980920951. The reversal of 783980920909 is 909029089387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421619059684 + 362361861225 = 649322^2 + 601965^2 .

It is a cyclic number.

It is not a de Polignac number, because 783980920909 - 2¹ = 783980920907 is a prime.

It is a super-2 number, since 2×783980920909² (a number of 25 digits) contains 22 as substring.

Together with 783980920907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (783980920901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391990460454 + 391990460455.

It is an arithmetic number, because the mean of its divisors is an integer number (391990460455).

Almost surely, 2^783980920909 is an apocalyptic number.

It is an amenable number.

783980920909 is a deficient number, since it is larger than the sum of its proper divisors (1).

783980920909 is an equidigital number, since it uses as much as digits as its factorization.

783980920909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17635968, while the sum is 64.

The spelling of 783980920909 in words is "seven hundred eighty-three billion, nine hundred eighty million, nine hundred twenty thousand, nine hundred nine".