155213555 has 8 divisors (see below), whose sum is σ = 212864352. Its totient is φ = 106432128.

The previous prime is 155213543. The next prime is 155213563. The reversal of 155213555 is 555312551.

155213555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 155213555 - 2¹⁴ = 155197171 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2217302 + ... + 2217371.

It is an arithmetic number, because the mean of its divisors is an integer number (26608044).

Almost surely, 2^155213555 is an apocalyptic number.

155213555 is a deficient number, since it is larger than the sum of its proper divisors (57650797).

155213555 is an equidigital number, since it uses as much as digits as its factorization.

155213555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434685.

The product of its digits is 18750, while the sum is 32.

The square root of 155213555 is about 12458.4732210653. The cubic root of 155213555 is about 537.4151212646.

It can be divided in two parts, 15521 and 3555, that multiplied together give a palindrome (55177155).

The spelling of 155213555 in words is "one hundred fifty-five million, two hundred thirteen thousand, five hundred fifty-five".