216155554 has 16 divisors (see below), whose sum is σ = 336305016. Its totient is φ = 104112000.

The previous prime is 216155549. The next prime is 216155557. The reversal of 216155554 is 455551612.

It can be written as a sum of positive squares in 4 ways, for example, as 202635225 + 13520329 = 14235^2 + 3677^2 .

It is a super-4 number, since 4×216155554⁴ (a number of 34 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (216155557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6987 + ... + 21934.

Almost surely, 2^216155554 is an apocalyptic number.

216155554 is a deficient number, since it is larger than the sum of its proper divisors (120149462).

216155554 is a wasteful number, since it uses less digits than its factorization.

216155554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29061.

The product of its digits is 30000, while the sum is 34.

The square root of 216155554 is about 14702.2295588118. The cubic root of 216155554 is about 600.1439969202.

The spelling of 216155554 in words is "two hundred sixteen million, one hundred fifty-five thousand, five hundred fifty-four".