1642541154889 has 2 divisors, whose sum is σ = 1642541154890. Its totient is φ = 1642541154888.

The previous prime is 1642541154871. The next prime is 1642541154937. The reversal of 1642541154889 is 9884511452461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1411800228864 + 230740926025 = 1188192^2 + 480355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642541154889 - 2²⁷ = 1642406937161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642541154689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821270577444 + 821270577445.

It is an arithmetic number, because the mean of its divisors is an integer number (821270577445).

Almost surely, 2^{1642541154889} is an apocalyptic number.

It is an amenable number.

1642541154889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642541154889 is an equidigital number, since it uses as much as digits as its factorization.

1642541154889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11059200, while the sum is 58.

The spelling of 1642541154889 in words is "one trillion, six hundred forty-two billion, five hundred forty-one million, one hundred fifty-four thousand, eight hundred eighty-nine".