65016621 has 16 divisors (see below), whose sum is σ = 96493120. Its totient is φ = 43266960.

The previous prime is 65016583. The next prime is 65016661. The reversal of 65016621 is 12661056.

It is a happy number.

65016621 is a `hidden beast` number, since 650 + 1 + 6 + 6 + 2 + 1 = 666.

It is not a de Polignac number, because 65016621 - 2¹⁰ = 65015597 is a prime.

It is a super-2 number, since 2×65016621² = 8454322012515282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65016661) 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, 16026 + ... + 19668.

It is an arithmetic number, because the mean of its divisors is an integer number (6030820).

Almost surely, 2^65016621 is an apocalyptic number.

It is an amenable number.

65016621 is a deficient number, since it is larger than the sum of its proper divisors (31476499).

65016621 is a wasteful number, since it uses less digits than its factorization.

65016621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313 (or 4307 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 65016621 is about 8063.2884730735. The cubic root of 65016621 is about 402.1068439550.

Adding to 65016621 its reverse (12661056), we get a palindrome (77677677).

It can be divided in two parts, 650 and 16621, that added together give a palindrome (17271).

The spelling of 65016621 in words is "sixty-five million, sixteen thousand, six hundred twenty-one".