1891018690577 has 2 divisors, whose sum is σ = 1891018690578. Its totient is φ = 1891018690576.

The previous prime is 1891018690553. The next prime is 1891018690591. The reversal of 1891018690577 is 7750968101981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1531247854096 + 359770836481 = 1237436^2 + 599809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1891018690577 is a prime.

It is a super-2 number, since 2×1891018690577² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1891018698577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945509345288 + 945509345289.

It is an arithmetic number, because the mean of its divisors is an integer number (945509345289).

Almost surely, 2^{1891018690577} is an apocalyptic number.

It is an amenable number.

1891018690577 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891018690577 is an equidigital number, since it uses as much as digits as its factorization.

1891018690577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 62.

The spelling of 1891018690577 in words is "one trillion, eight hundred ninety-one billion, eighteen million, six hundred ninety thousand, five hundred seventy-seven".