862783778401 has 2 divisors, whose sum is σ = 862783778402. Its totient is φ = 862783778400.

The previous prime is 862783778369. The next prime is 862783778453. The reversal of 862783778401 is 104877387268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787159328400 + 75624450001 = 887220^2 + 274999^2 .

It is a cyclic number.

It is not a de Polignac number, because 862783778401 - 2⁵ = 862783778369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 862783778401.

It is not a weakly prime, because it can be changed into another prime (862783778471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431391889200 + 431391889201.

It is an arithmetic number, because the mean of its divisors is an integer number (431391889201).

Almost surely, 2^862783778401 is an apocalyptic number.

It is an amenable number.

862783778401 is a deficient number, since it is larger than the sum of its proper divisors (1).

862783778401 is an equidigital number, since it uses as much as digits as its factorization.

862783778401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25288704, while the sum is 61.

The spelling of 862783778401 in words is "eight hundred sixty-two billion, seven hundred eighty-three million, seven hundred seventy-eight thousand, four hundred one".