66117901 has 4 divisors (see below), whose sum is σ = 66157372. Its totient is φ = 66078432.

The previous prime is 66117899. The next prime is 66117911. The reversal of 66117901 is 10971166.

66117901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35581225 + 30536676 = 5965^2 + 5526^2 .

It is a cyclic number.

It is not a de Polignac number, because 66117901 - 2¹ = 66117899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66117911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17106 + ... + 20611.

It is an arithmetic number, because the mean of its divisors is an integer number (16539343).

Almost surely, 2^66117901 is an apocalyptic number.

It is an amenable number.

66117901 is a deficient number, since it is larger than the sum of its proper divisors (39471).

66117901 is a wasteful number, since it uses less digits than its factorization.

66117901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39470.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 66117901 is about 8131.2914718389. The cubic root of 66117901 is about 404.3644984281.

The spelling of 66117901 in words is "sixty-six million, one hundred seventeen thousand, nine hundred one".