66146421 has 16 divisors (see below), whose sum is σ = 96644160. Its totient is φ = 39909120.

The previous prime is 66146401. The next prime is 66146441. The reversal of 66146421 is 12464166.

It is an interprime number because it is at equal distance from previous prime (66146401) and next prime (66146441).

It is not a de Polignac number, because 66146421 - 2⁵ = 66146389 is a prime.

It is a super-2 number, since 2×66146421² = 8750698022218482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66146401) 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, 3181 + ... + 11933.

It is an arithmetic number, because the mean of its divisors is an integer number (6040260).

Almost surely, 2^66146421 is an apocalyptic number.

It is an amenable number.

66146421 is a deficient number, since it is larger than the sum of its proper divisors (30497739).

66146421 is a wasteful number, since it uses less digits than its factorization.

66146421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8996.

The product of its digits is 6912, while the sum is 30.

The square root of 66146421 is about 8133.0450017198. The cubic root of 66146421 is about 404.4226310344.

The spelling of 66146421 in words is "sixty-six million, one hundred forty-six thousand, four hundred twenty-one".