155216172 has 12 divisors (see below), whose sum is σ = 362171096. Its totient is φ = 51738720.

The previous prime is 155216129. The next prime is 155216183. The reversal of 155216172 is 271612551.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6467329 + ... + 6467352.

Almost surely, 2^155216172 is an apocalyptic number.

155216172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155216172 is an abundant number, since it is smaller than the sum of its proper divisors (206954924).

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

155216172 is a wasteful number, since it uses less digits than its factorization.

155216172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12934688 (or 12934686 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The square root of 155216172 is about 12458.5782495436. The cubic root of 155216172 is about 537.4181416354.

The spelling of 155216172 in words is "one hundred fifty-five million, two hundred sixteen thousand, one hundred seventy-two".