1099944687557 has 2 divisors, whose sum is σ = 1099944687558. Its totient is φ = 1099944687556.

The previous prime is 1099944687547. The next prime is 1099944687571. The reversal of 1099944687557 is 7557864499901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 774595372321 + 325349315236 = 880111^2 + 570394^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099944687557 - 2³⁸ = 825066780613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1099944687547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549972343778 + 549972343779.

It is an arithmetic number, because the mean of its divisors is an integer number (549972343779).

Almost surely, 2^{1099944687557} is an apocalyptic number.

It is an amenable number.

1099944687557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099944687557 is an equidigital number, since it uses as much as digits as its factorization.

1099944687557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 685843200, while the sum is 74.

The spelling of 1099944687557 in words is "one trillion, ninety-nine billion, nine hundred forty-four million, six hundred eighty-seven thousand, five hundred fifty-seven".