216165554 has 16 divisors (see below), whose sum is σ = 354170880. Its totient is φ = 98133360.

The previous prime is 216165529. The next prime is 216165559. The reversal of 216165554 is 455561612.

216165554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216165554² = 93455093472253832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216165559) 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, 13007 + ... + 24525.

It is an arithmetic number, because the mean of its divisors is an integer number (22135680).

Almost surely, 2^216165554 is an apocalyptic number.

216165554 is a deficient number, since it is larger than the sum of its proper divisors (138005326).

216165554 is a wasteful number, since it uses less digits than its factorization.

216165554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12385.

The product of its digits is 36000, while the sum is 35.

The square root of 216165554 is about 14702.5696393522. The cubic root of 216165554 is about 600.1532515940.

The spelling of 216165554 in words is "two hundred sixteen million, one hundred sixty-five thousand, five hundred fifty-four".