780001000001 has 2 divisors, whose sum is σ = 780001000002. Its totient is φ = 780001000000.

The previous prime is 780000999917. The next prime is 780001000007. The reversal of 780001000001 is 100000100087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689192190976 + 90808809025 = 830176^2 + 301345^2 .

It is an emirp because it is prime and its reverse (100000100087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780001000001 - 2¹⁰ = 780000998977 is a prime.

It is not a weakly prime, because it can be changed into another prime (780001000007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390000500000 + 390000500001.

It is an arithmetic number, because the mean of its divisors is an integer number (390000500001).

Almost surely, 2^780001000001 is an apocalyptic number.

It is an amenable number.

780001000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

780001000001 is an equidigital number, since it uses as much as digits as its factorization.

780001000001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 780001000001 its reverse (100000100087), we get a palindrome (880001100088).

The spelling of 780001000001 in words is "seven hundred eighty billion, one million, one", and thus it is an aban number.