65166816 has 192 divisors, whose sum is σ = 207277056. Its totient is φ = 17664000.

The previous prime is 65166793. The next prime is 65166817. The reversal of 65166816 is 61866156.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65166817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 645166 + ... + 645266.

It is an arithmetic number, because the mean of its divisors is an integer number (1079568).

Almost surely, 2^65166816 is an apocalyptic number.

65166816 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65166816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103638528).

65166816 is an abundant number, since it is smaller than the sum of its proper divisors (142110240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65166816 is a wasteful number, since it uses less digits than its factorization.

65166816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 177 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 65166816 is about 8072.5966082791. The cubic root of 65166816 is about 402.4162417179.

The spelling of 65166816 in words is "sixty-five million, one hundred sixty-six thousand, eight hundred sixteen".