155216505 has 8 divisors (see below), whose sum is σ = 248346432. Its totient is φ = 82782128.

The previous prime is 155216483. The next prime is 155216519. The reversal of 155216505 is 505612551.

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 155216505 - 2⁹ = 155215993 is a prime.

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, 5173869 + ... + 5173898.

It is an arithmetic number, because the mean of its divisors is an integer number (31043304).

Almost surely, 2^155216505 is an apocalyptic number.

155216505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155216505 is a deficient number, since it is larger than the sum of its proper divisors (93129927).

155216505 is a wasteful number, since it uses less digits than its factorization.

155216505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10347775.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 155216505 is about 12458.5916138222. The cubic root of 155216505 is about 537.4185259598.

The spelling of 155216505 in words is "one hundred fifty-five million, two hundred sixteen thousand, five hundred five".