66420955 has 8 divisors (see below), whose sum is σ = 84393792. Its totient is φ = 50011008.

The previous prime is 66420947. The next prime is 66420971. The reversal of 66420955 is 55902466.

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

It is not a de Polignac number, because 66420955 - 2³ = 66420947 is a prime.

It is a super-2 number, since 2×66420955² = 8823486526224050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390627 + ... + 390796.

It is an arithmetic number, because the mean of its divisors is an integer number (10549224).

Almost surely, 2^66420955 is an apocalyptic number.

66420955 is a deficient number, since it is larger than the sum of its proper divisors (17972837).

66420955 is a wasteful number, since it uses less digits than its factorization.

66420955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781445.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 66420955 is about 8149.9052141727. The cubic root of 66420955 is about 404.9813637718.

The spelling of 66420955 in words is "sixty-six million, four hundred twenty thousand, nine hundred fifty-five".