1542889045849 has 2 divisors, whose sum is σ = 1542889045850. Its totient is φ = 1542889045848.

The previous prime is 1542889045717. The next prime is 1542889045861. The reversal of 1542889045849 is 9485409882451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 991498147600 + 551390898249 = 995740^2 + 742557^2 .

It is a cyclic number.

It is not a de Polignac number, because 1542889045849 - 2⁹ = 1542889045337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1542889045879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771444522924 + 771444522925.

It is an arithmetic number, because the mean of its divisors is an integer number (771444522925).

Almost surely, 2^{1542889045849} is an apocalyptic number.

It is an amenable number.

1542889045849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542889045849 is an equidigital number, since it uses as much as digits as its factorization.

1542889045849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132710400, while the sum is 67.

The spelling of 1542889045849 in words is "one trillion, five hundred forty-two billion, eight hundred eighty-nine million, forty-five thousand, eight hundred forty-nine".