155553881 has 12 divisors (see below), whose sum is σ = 181164240. Its totient is φ = 133174440.

The previous prime is 155553863. The next prime is 155553901. The reversal of 155553881 is 188355551.

It is a happy number.

It is not a de Polignac number, because 155553881 - 2¹⁰ = 155552857 is a prime.

It is a super-2 number, since 2×155553881² = 48394019788324322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155553841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62030 + ... + 64488.

It is an arithmetic number, because the mean of its divisors is an integer number (15097020).

Almost surely, 2^155553881 is an apocalyptic number.

It is an amenable number.

155553881 is a deficient number, since it is larger than the sum of its proper divisors (25610359).

155553881 is a wasteful number, since it uses less digits than its factorization.

155553881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3764 (or 3757 counting only the distinct ones).

The product of its digits is 120000, while the sum is 41.

The square root of 155553881 is about 12472.1241574962. The cubic root of 155553881 is about 537.8076188280.

The spelling of 155553881 in words is "one hundred fifty-five million, five hundred fifty-three thousand, eight hundred eighty-one".