65406066 has 48 divisors (see below), whose sum is σ = 150075072. Its totient is φ = 18953440.

The previous prime is 65406031. The next prime is 65406067. The reversal of 65406066 is 66060456.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (65406067) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14740 + ... + 18656.

It is an arithmetic number, because the mean of its divisors is an integer number (3126564).

Almost surely, 2^65406066 is an apocalyptic number.

65406066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 65406066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75037536).

65406066 is an abundant number, since it is smaller than the sum of its proper divisors (84669006).

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

65406066 is a wasteful number, since it uses less digits than its factorization.

65406066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967 (or 3956 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 65406066 is about 8087.4016841010. The cubic root of 65406066 is about 402.9081101669.

The spelling of 65406066 in words is "sixty-five million, four hundred six thousand, sixty-six".