65366665 has 48 divisors (see below), whose sum is σ = 99715968. Its totient is φ = 40255488.

The previous prime is 65366663. The next prime is 65366689. The reversal of 65366665 is 56666356.

It is a happy number.

It is not a de Polignac number, because 65366665 - 2¹ = 65366663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (65366663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254217 + ... + 254473.

It is an arithmetic number, because the mean of its divisors is an integer number (2077416).

Almost surely, 2^65366665 is an apocalyptic number.

65366665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65366665 is a deficient number, since it is larger than the sum of its proper divisors (34349303).

65366665 is a wasteful number, since it uses less digits than its factorization.

65366665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 325 counting only the distinct ones).

The product of its digits is 583200, while the sum is 43.

The square root of 65366665 is about 8084.9653678912. The cubic root of 65366665 is about 402.8271891748.

The spelling of 65366665 in words is "sixty-five million, three hundred sixty-six thousand, six hundred sixty-five".