66080421 has 16 divisors (see below), whose sum is σ = 106797120. Its totient is φ = 40048560.

The previous prime is 66080407. The next prime is 66080447. The reversal of 66080421 is 12408066.

It is not a de Polignac number, because 66080421 - 2²² = 61886117 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66080471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110950 + ... + 111543.

It is an arithmetic number, because the mean of its divisors is an integer number (6674820).

Almost surely, 2^66080421 is an apocalyptic number.

It is an amenable number.

66080421 is a deficient number, since it is larger than the sum of its proper divisors (40716699).

66080421 is a wasteful number, since it uses less digits than its factorization.

66080421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222513 (or 222507 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 66080421 is about 8128.9864681890. The cubic root of 66080421 is about 404.2880771373.

Adding to 66080421 its reverse (12408066), we get a palindrome (78488487).

The spelling of 66080421 in words is "sixty-six million, eighty thousand, four hundred twenty-one".