66666264 has 96 divisors (see below), whose sum is σ = 196499520. Its totient is φ = 18790464.

The previous prime is 66666263. The next prime is 66666277. The reversal of 66666264 is 46266666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666263) 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, 97267 + ... + 97949.

It is an arithmetic number, because the mean of its divisors is an integer number (2046870).

Almost surely, 2^66666264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66666264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98249760).

66666264 is an abundant number, since it is smaller than the sum of its proper divisors (129833256).

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

66666264 is a wasteful number, since it uses less digits than its factorization.

66666264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 778 counting only the distinct ones).

The product of its digits is 373248, while the sum is 42.

The square root of 66666264 is about 8164.9411510433. The cubic root of 66666264 is about 405.4793166699.

The spelling of 66666264 in words is "sixty-six million, six hundred sixty-six thousand, two hundred sixty-four".