1216016265 has 16 divisors (see below), whose sum is σ = 1964892096. Its totient is φ = 642120000.

The previous prime is 1216016251. The next prime is 1216016287. The reversal of 1216016265 is 5626106121.

It is not a de Polignac number, because 1216016265 - 2⁶ = 1216016201 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399811 + ... + 402840.

It is an arithmetic number, because the mean of its divisors is an integer number (122805756).

Almost surely, 2^1216016265 is an apocalyptic number.

1216016265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216016265 is a deficient number, since it is larger than the sum of its proper divisors (748875831).

1216016265 is a wasteful number, since it uses less digits than its factorization.

1216016265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802760.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1216016265 is about 34871.4247629775. The cubic root of 1216016265 is about 1067.3654184098.

The spelling of 1216016265 in words is "one billion, two hundred sixteen million, sixteen thousand, two hundred sixty-five".