155553681 has 8 divisors (see below), whose sum is σ = 207728064. Its totient is φ = 103540880.

The previous prime is 155553679. The next prime is 155553701. The reversal of 155553681 is 186355551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155553681 - 2¹ = 155553679 is a prime.

It is a super-2 number, since 2×155553681² = 48393895345299522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155553641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38130 + ... + 42011.

It is an arithmetic number, because the mean of its divisors is an integer number (25966008).

Almost surely, 2^155553681 is an apocalyptic number.

It is an amenable number.

155553681 is a deficient number, since it is larger than the sum of its proper divisors (52174383).

155553681 is an equidigital number, since it uses as much as digits as its factorization.

155553681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80791.

The product of its digits is 90000, while the sum is 39.

The square root of 155553681 is about 12472.1161396132. The cubic root of 155553681 is about 537.8073883364.

The spelling of 155553681 in words is "one hundred fifty-five million, five hundred fifty-three thousand, six hundred eighty-one".