780478015693 has 2 divisors, whose sum is σ = 780478015694. Its totient is φ = 780478015692.

The previous prime is 780478015627. The next prime is 780478015699. The reversal of 780478015693 is 396510874087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 502456980964 + 278021034729 = 708842^2 + 527277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780478015693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780478015699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390239007846 + 390239007847.

It is an arithmetic number, because the mean of its divisors is an integer number (390239007847).

Almost surely, 2^780478015693 is an apocalyptic number.

It is an amenable number.

780478015693 is a deficient number, since it is larger than the sum of its proper divisors (1).

780478015693 is an equidigital number, since it uses as much as digits as its factorization.

780478015693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 780478015693 in words is "seven hundred eighty billion, four hundred seventy-eight million, fifteen thousand, six hundred ninety-three".