66844401 has 24 divisors (see below), whose sum is σ = 99645696. Its totient is φ = 39798720.

The previous prime is 66844399. The next prime is 66844409. The reversal of 66844401 is 10444866.

It is not a de Polignac number, because 66844401 - 2¹ = 66844399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66844409) 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, 13591 + ... + 17843.

It is an arithmetic number, because the mean of its divisors is an integer number (4151904).

Almost surely, 2^66844401 is an apocalyptic number.

It is an amenable number.

66844401 is a deficient number, since it is larger than the sum of its proper divisors (32801295).

66844401 is a wasteful number, since it uses less digits than its factorization.

66844401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313 (or 4300 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 66844401 is about 8175.8425253915. The cubic root of 66844401 is about 405.8401519945.

The spelling of 66844401 in words is "sixty-six million, eight hundred forty-four thousand, four hundred one".