16061645 has 4 divisors (see below), whose sum is σ = 19273980. Its totient is φ = 12849312.

The previous prime is 16061623. The next prime is 16061657. The reversal of 16061645 is 54616061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54616061 = 157 ⋅347873.

It can be written as a sum of positive squares in 2 ways, for example, as 6538249 + 9523396 = 2557^2 + 3086^2 .

It is a cyclic number.

It is not a de Polignac number, because 16061645 - 2¹² = 16057549 is a prime.

It is a super-3 number, since 3×16061645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606160 + ... + 1606169.

It is an arithmetic number, because the mean of its divisors is an integer number (4818495).

Almost surely, 2^16061645 is an apocalyptic number.

It is an amenable number.

16061645 is a deficient number, since it is larger than the sum of its proper divisors (3212335).

16061645 is an equidigital number, since it uses as much as digits as its factorization.

16061645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3212334.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 16061645 is about 4007.6982171815. The cubic root of 16061645 is about 252.3074112271.

The spelling of 16061645 in words is "sixteen million, sixty-one thousand, six hundred forty-five".