155217056 has 12 divisors (see below), whose sum is σ = 305583642. Its totient is φ = 77608512.

The previous prime is 155217047. The next prime is 155217059. The reversal of 155217056 is 650712551.

It can be written as a sum of positive squares in only one way, i.e., 141229456 + 13987600 = 11884^2 + 3740^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 4850533 = 155217056 / (1 + 5 + 5 + 2 + 1 + 7 + 0 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (155217059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2425235 + ... + 2425298.

Almost surely, 2^155217056 is an apocalyptic number.

155217056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

155217056 is a deficient number, since it is larger than the sum of its proper divisors (150366586).

155217056 is an equidigital number, since it uses as much as digits as its factorization.

155217056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850543 (or 4850535 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 155217056 is about 12458.6137270565. The cubic root of 155217056 is about 537.4191618829.

The spelling of 155217056 in words is "one hundred fifty-five million, two hundred seventeen thousand, fifty-six".