155688081 has 8 divisors (see below), whose sum is σ = 216609600. Its totient is φ = 99279312.

The previous prime is 155688077. The next prime is 155688131. The reversal of 155688081 is 180886551.

It is a happy number.

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

It is not a de Polignac number, because 155688081 - 2² = 155688077 is a prime.

It is a super-2 number, since 2×155688081² = 48477557130925122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155688011) 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, 1128106 + ... + 1128243.

It is an arithmetic number, because the mean of its divisors is an integer number (27076200).

Almost surely, 2^155688081 is an apocalyptic number.

It is an amenable number.

155688081 is a deficient number, since it is larger than the sum of its proper divisors (60921519).

155688081 is a wasteful number, since it uses less digits than its factorization.

155688081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256375.

The product of its (nonzero) digits is 76800, while the sum is 42.

The square root of 155688081 is about 12477.5029953913. The cubic root of 155688081 is about 537.9622341432.

The spelling of 155688081 in words is "one hundred fifty-five million, six hundred eighty-eight thousand, eighty-one".