66121883 has 4 divisors (see below), whose sum is σ = 66597720. Its totient is φ = 65646048.

The previous prime is 66121877. The next prime is 66121901. The reversal of 66121883 is 38812166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66121883 - 2¹² = 66117787 is a prime.

It is a super-2 number, since 2×66121883² = 8744206822931378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66121873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237710 + ... + 237987.

It is an arithmetic number, because the mean of its divisors is an integer number (16649430).

Almost surely, 2^66121883 is an apocalyptic number.

66121883 is a deficient number, since it is larger than the sum of its proper divisors (475837).

66121883 is a wasteful number, since it uses less digits than its factorization.

66121883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475836.

The product of its digits is 13824, while the sum is 35.

The square root of 66121883 is about 8131.5363247052. The cubic root of 66121883 is about 404.3726159832.

The spelling of 66121883 in words is "sixty-six million, one hundred twenty-one thousand, eight hundred eighty-three".