1866349095977 has 2 divisors, whose sum is σ = 1866349095978. Its totient is φ = 1866349095976.

The previous prime is 1866349095973. The next prime is 1866349096009. The reversal of 1866349095977 is 7795909436681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1036845281536 + 829503814441 = 1018256^2 + 910771^2 .

It is an emirp because it is prime and its reverse (7795909436681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1866349095977 - 2² = 1866349095973 is a prime.

It is not a weakly prime, because it can be changed into another prime (1866349095973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933174547988 + 933174547989.

It is an arithmetic number, because the mean of its divisors is an integer number (933174547989).

Almost surely, 2^{1866349095977} is an apocalyptic number.

It is an amenable number.

1866349095977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866349095977 is an equidigital number, since it uses as much as digits as its factorization.

1866349095977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 617258880, while the sum is 74.

The spelling of 1866349095977 in words is "one trillion, eight hundred sixty-six billion, three hundred forty-nine million, ninety-five thousand, nine hundred seventy-seven".