1641166081 has 8 divisors (see below), whose sum is σ = 1754290944. Its totient is φ = 1531522080.

The previous prime is 1641166067. The next prime is 1641166091. The reversal of 1641166081 is 1806611461.

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 1641166081 - 2⁵ = 1641166049 is a prime.

It is a super-2 number, since 2×1641166081² = 5386852210849797122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1641166001) 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, 869241 + ... + 871126.

It is an arithmetic number, because the mean of its divisors is an integer number (219286368).

Almost surely, 2^1641166081 is an apocalyptic number.

It is an amenable number.

1641166081 is a deficient number, since it is larger than the sum of its proper divisors (113124863).

1641166081 is a wasteful number, since it uses less digits than its factorization.

1641166081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740431.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1641166081 is about 40511.3080633050. The cubic root of 1641166081 is about 1179.5531394730.

The spelling of 1641166081 in words is "one billion, six hundred forty-one million, one hundred sixty-six thousand, eighty-one".