155017856 has 64 divisors (see below), whose sum is σ = 364392960. Its totient is φ = 64281600.

The previous prime is 155017853. The next prime is 155017859. The reversal of 155017856 is 658710551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155017853) and next prime (155017859).

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (155017853) 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 7 ways as a sum of consecutive naturals, for example, 24986 + ... + 30566.

It is an arithmetic number, because the mean of its divisors is an integer number (5693640).

Almost surely, 2^155017856 is an apocalyptic number.

155017856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155017856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182196480).

155017856 is an abundant number, since it is smaller than the sum of its proper divisors (209375104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155017856 is an equidigital number, since it uses as much as digits as its factorization.

155017856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633 (or 5621 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 38.

The square root of 155017856 is about 12450.6166915539. The cubic root of 155017856 is about 537.1891619742.

The spelling of 155017856 in words is "one hundred fifty-five million, seventeen thousand, eight hundred fifty-six".