16615965 has 16 divisors (see below), whose sum is σ = 26725248. Its totient is φ = 8815296.

The previous prime is 16615897. The next prime is 16615967. The reversal of 16615965 is 56951661.

It is not a de Polignac number, because 16615965 - 2¹⁵ = 16583197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16615967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144 + ... + 5766.

It is an arithmetic number, because the mean of its divisors is an integer number (1670328).

Almost surely, 2^16615965 is an apocalyptic number.

16615965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16615965 is a deficient number, since it is larger than the sum of its proper divisors (10109283).

16615965 is a wasteful number, since it uses less digits than its factorization.

16615965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5828.

The product of its digits is 48600, while the sum is 39.

The square root of 16615965 is about 4076.2685142174. The cubic root of 16615965 is about 255.1771932610.

It can be divided in two parts, 1661 and 5965, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 16615965 in words is "sixteen million, six hundred fifteen thousand, nine hundred sixty-five".