155440055 has 8 divisors (see below), whose sum is σ = 190866192. Its totient is φ = 121459968.

The previous prime is 155440037. The next prime is 155440057. The reversal of 155440055 is 550044551.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155440055 is a prime.

It is a super-2 number, since 2×155440055² = 48323221396806050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155440057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361274 + ... + 361703.

It is an arithmetic number, because the mean of its divisors is an integer number (23858274).

Almost surely, 2^155440055 is an apocalyptic number.

155440055 is a deficient number, since it is larger than the sum of its proper divisors (35426137).

155440055 is an equidigital number, since it uses as much as digits as its factorization.

155440055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723025.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 155440055 is about 12467.5601061314. The cubic root of 155440055 is about 537.6764072132.

The spelling of 155440055 in words is "one hundred fifty-five million, four hundred forty thousand, fifty-five".