840607557149 has 2 divisors, whose sum is σ = 840607557150. Its totient is φ = 840607557148.

The previous prime is 840607557077. The next prime is 840607557187. The reversal of 840607557149 is 941755706048.

It is a happy number.

840607557149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827521341124 + 13086216025 = 909682^2 + 114395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840607557149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840607557094 and 840607557103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840607559149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420303778574 + 420303778575.

It is an arithmetic number, because the mean of its divisors is an integer number (420303778575).

Almost surely, 2^840607557149 is an apocalyptic number.

It is an amenable number.

840607557149 is a deficient number, since it is larger than the sum of its proper divisors (1).

840607557149 is an equidigital number, since it uses as much as digits as its factorization.

840607557149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 840607557149 in words is "eight hundred forty billion, six hundred seven million, five hundred fifty-seven thousand, one hundred forty-nine".