66426621 has 8 divisors (see below), whose sum is σ = 90021024. Its totient is φ = 43558320.

The previous prime is 66426587. The next prime is 66426623. The reversal of 66426621 is 12662466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66426621 - 2¹⁴ = 66410237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66426623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181311 + ... + 181676.

It is an arithmetic number, because the mean of its divisors is an integer number (11252628).

Almost surely, 2^66426621 is an apocalyptic number.

66426621 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66426621 is a deficient number, since it is larger than the sum of its proper divisors (23594403).

66426621 is a wasteful number, since it uses less digits than its factorization.

66426621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363051.

The product of its digits is 20736, while the sum is 33.

The square root of 66426621 is about 8150.2528181646. The cubic root of 66426621 is about 404.9928790091.

The spelling of 66426621 in words is "sixty-six million, four hundred twenty-six thousand, six hundred twenty-one".