66121371 has 6 divisors (see below), whose sum is σ = 95508660. Its totient is φ = 44080908.

The previous prime is 66121351. The next prime is 66121373. The reversal of 66121371 is 17312166.

It is not a de Polignac number, because 66121371 - 2⁷ = 66121243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66121373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3673401 + ... + 3673418.

It is an arithmetic number, because the mean of its divisors is an integer number (15918110).

Almost surely, 2^66121371 is an apocalyptic number.

66121371 is a deficient number, since it is larger than the sum of its proper divisors (29387289).

66121371 is a wasteful number, since it uses less digits than its factorization.

66121371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7346825 (or 7346822 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 66121371 is about 8131.5048422786. The cubic root of 66121371 is about 404.3715722576.

The spelling of 66121371 in words is "sixty-six million, one hundred twenty-one thousand, three hundred seventy-one".