1689550227881 has 2 divisors, whose sum is σ = 1689550227882. Its totient is φ = 1689550227880.

The previous prime is 1689550227877. The next prime is 1689550227899. The reversal of 1689550227881 is 1887220559861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217361362281 + 472188865600 = 1103341^2 + 687160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689550227881 - 2² = 1689550227877 is a prime.

It is a super-2 number, since 2×1689550227881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1689550227481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844775113940 + 844775113941.

It is an arithmetic number, because the mean of its divisors is an integer number (844775113941).

Almost surely, 2^{1689550227881} is an apocalyptic number.

It is an amenable number.

1689550227881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689550227881 is an equidigital number, since it uses as much as digits as its factorization.

1689550227881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19353600, while the sum is 62.

The spelling of 1689550227881 in words is "one trillion, six hundred eighty-nine billion, five hundred fifty million, two hundred twenty-seven thousand, eight hundred eighty-one".