442778794457 has 2 divisors, whose sum is σ = 442778794458. Its totient is φ = 442778794456.

The previous prime is 442778794433. The next prime is 442778794477. The reversal of 442778794457 is 754497877244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276755957776 + 166022836681 = 526076^2 + 407459^2 .

It is a cyclic number.

It is not a de Polignac number, because 442778794457 - 2⁸ = 442778794201 is a prime.

It is not a weakly prime, because it can be changed into another prime (442778794477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221389397228 + 221389397229.

It is an arithmetic number, because the mean of its divisors is an integer number (221389397229).

Almost surely, 2^442778794457 is an apocalyptic number.

It is an amenable number.

442778794457 is a deficient number, since it is larger than the sum of its proper divisors (1).

442778794457 is an equidigital number, since it uses as much as digits as its factorization.

442778794457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442552320, while the sum is 68.

The spelling of 442778794457 in words is "four hundred forty-two billion, seven hundred seventy-eight million, seven hundred ninety-four thousand, four hundred fifty-seven".