181616061 has 8 divisors (see below), whose sum is σ = 264168864. Its totient is φ = 110070320.

The previous prime is 181616053. The next prime is 181616063. The reversal of 181616061 is 160616181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181616061 - 2³ = 181616053 is a prime.

It is a super-2 number, since 2×181616061² = 65968787226311442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181616063) 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, 2751726 + ... + 2751791.

It is an arithmetic number, because the mean of its divisors is an integer number (33021108).

Almost surely, 2^181616061 is an apocalyptic number.

181616061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181616061 is a deficient number, since it is larger than the sum of its proper divisors (82552803).

181616061 is a wasteful number, since it uses less digits than its factorization.

181616061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5503531.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 181616061 is about 13476.5003246392. The cubic root of 181616061 is about 566.3063317397.

The spelling of 181616061 in words is "one hundred eighty-one million, six hundred sixteen thousand, sixty-one".