155553726409 has 9 divisors (see below), whose sum is σ = 156663903207. Its totient is φ = 154451370024.

The previous prime is 155553726353. The next prime is 155553726421. The reversal of 155553726409 is 904627355551.

The square root of 155553726409 is 394403.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18224190009 + 137329536400 = 134997^2 + 370580^2 .

It is not a de Polignac number, because 155553726409 - 2¹³ = 155553718217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155553726439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 58764724 + ... + 58767370.

Almost surely, 2^155553726409 is an apocalyptic number.

155553726409 is the 394403-rd square number.

155553726409 is the 197202-nd centered octagonal number.

It is an amenable number.

155553726409 is a deficient number, since it is larger than the sum of its proper divisors (1110176798).

155553726409 is an frugal number, since it uses more digits than its factorization.

155553726409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592 (or 2796 counting only the distinct ones).

The product of its (nonzero) digits is 5670000, while the sum is 52.

The spelling of 155553726409 in words is "one hundred fifty-five billion, five hundred fifty-three million, seven hundred twenty-six thousand, four hundred nine".