1397822819677 has 2 divisors, whose sum is σ = 1397822819678. Its totient is φ = 1397822819676.

The previous prime is 1397822819647. The next prime is 1397822819717. The reversal of 1397822819677 is 7769182287931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1373820754201 + 24002065476 = 1172101^2 + 154926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397822819677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397822819647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698911409838 + 698911409839.

It is an arithmetic number, because the mean of its divisors is an integer number (698911409839).

Almost surely, 2^{1397822819677} is an apocalyptic number.

It is an amenable number.

1397822819677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397822819677 is an equidigital number, since it uses as much as digits as its factorization.

1397822819677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128024064, while the sum is 70.

The spelling of 1397822819677 in words is "one trillion, three hundred ninety-seven billion, eight hundred twenty-two million, eight hundred nineteen thousand, six hundred seventy-seven".