1677387619549 has 2 divisors, whose sum is σ = 1677387619550. Its totient is φ = 1677387619548.

The previous prime is 1677387619543. The next prime is 1677387619553. The reversal of 1677387619549 is 9459167837761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1665408317049 + 11979302500 = 1290507^2 + 109450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1677387619549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1677387619543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 838693809774 + 838693809775.

It is an arithmetic number, because the mean of its divisors is an integer number (838693809775).

Almost surely, 2^{1677387619549} is an apocalyptic number.

It is an amenable number.

1677387619549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1677387619549 is an equidigital number, since it uses as much as digits as its factorization.

1677387619549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480090240, while the sum is 73.

The spelling of 1677387619549 in words is "one trillion, six hundred seventy-seven billion, three hundred eighty-seven million, six hundred nineteen thousand, five hundred forty-nine".