66421870 has 8 divisors (see below), whose sum is σ = 119559384. Its totient is φ = 26568744.

The previous prime is 66421837. The next prime is 66421903. The reversal of 66421870 is 7812466.

It is an interprime number because it is at equal distance from previous prime (66421837) and next prime (66421903).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3321084 + ... + 3321103.

It is an arithmetic number, because the mean of its divisors is an integer number (14944923).

Almost surely, 2^66421870 is an apocalyptic number.

66421870 is a deficient number, since it is larger than the sum of its proper divisors (53137514).

66421870 is a wasteful number, since it uses less digits than its factorization.

66421870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642194.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66421870 is about 8149.9613496016. The cubic root of 66421870 is about 404.9832234071.

The spelling of 66421870 in words is "sixty-six million, four hundred twenty-one thousand, eight hundred seventy".