155553 has 8 divisors (see below), whose sum is σ = 218400. Its totient is φ = 98208.

The previous prime is 155539. The next prime is 155557. The reversal of 155553 is 355551.

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

It is not a de Polignac number, because 155553 - 2⁴ = 155537 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155553.

It is not an unprimeable number, because it can be changed into a prime (155557) 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, 1308 + ... + 1421.

It is an arithmetic number, because the mean of its divisors is an integer number (27300).

2¹⁵⁵⁵⁵³ is an apocalyptic number.

It is an amenable number.

155553 is a deficient number, since it is larger than the sum of its proper divisors (62847).

155553 is a wasteful number, since it uses less digits than its factorization.

155553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751.

The product of its digits is 1875, while the sum is 24.

The square root of 155553 is about 394.4020791020. The cubic root of 155553 is about 53.7806603511.

It can be divided in two parts, 15555 and 3, that multiplied together give a triangular number (46665 = T₃₀₅).

The spelling of 155553 in words is "one hundred fifty-five thousand, five hundred fifty-three".