155585280249 has 63 divisors (see below), whose sum is σ = 271486388757. Its totient is φ = 88863274584.

The previous prime is 155585280247. The next prime is 155585280251. The reversal of 155585280249 is 942082585551.

The square root of 155585280249 is 394443.

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

155585280249 is a `hidden beast` number, since 1 + 5 + 558 + 5 + 2 + 80 + 2 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (155585280247) and next prime (155585280251).

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 155585280249 - 2¹ = 155585280247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155585280195 and 155585280204.

It is not an unprimeable number, because it can be changed into a prime (155585280241) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 74548684 + ... + 74550770.

Almost surely, 2^155585280249 is an apocalyptic number.

155585280249 is the 394443-rd square number.

155585280249 is the 197222-nd centered octagonal number.

It is an amenable number.

155585280249 is a deficient number, since it is larger than the sum of its proper divisors (115901108508).

155585280249 is an frugal number, since it uses more digits than its factorization.

155585280249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4206 (or 2097 counting only the distinct ones).

The product of its (nonzero) digits is 5760000, while the sum is 54.

The spelling of 155585280249 in words is "one hundred fifty-five billion, five hundred eighty-five million, two hundred eighty thousand, two hundred forty-nine".