155997216 has 36 divisors (see below), whose sum is σ = 443617902. Its totient is φ = 51998976.

The previous prime is 155997211. The next prime is 155997221. The reversal of 155997216 is 612799551.

155997216 is a `hidden beast` number, since 1 + 559 + 97 + 2 + 1 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (155997211) and next prime (155997221).

It can be written as a sum of positive squares in only one way, i.e., 134652816 + 21344400 = 11604^2 + 4620^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (155997211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 270541 + ... + 271116.

Almost surely, 2^155997216 is an apocalyptic number.

155997216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

155997216 is an abundant number, since it is smaller than the sum of its proper divisors (287620686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155997216 is a wasteful number, since it uses less digits than its factorization.

155997216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541673 (or 541662 counting only the distinct ones).

The product of its digits is 170100, while the sum is 45.

The square root of 155997216 is about 12489.8845471045. The cubic root of 155997216 is about 538.3180588683.

The spelling of 155997216 in words is "one hundred fifty-five million, nine hundred ninety-seven thousand, two hundred sixteen".