66954901 has 4 divisors (see below), whose sum is σ = 72105292. Its totient is φ = 61804512.

The previous prime is 66954887. The next prime is 66954919. The reversal of 66954901 is 10945966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10945966 = 2 ⋅5472983.

It can be written as a sum of positive squares in 2 ways, for example, as 12180100 + 54774801 = 3490^2 + 7401^2 .

It is a cyclic number.

It is not a de Polignac number, because 66954901 - 2⁵ = 66954869 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 (66954961) 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 3 ways as a sum of consecutive naturals, for example, 2575176 + ... + 2575201.

It is an arithmetic number, because the mean of its divisors is an integer number (18026323).

Almost surely, 2^66954901 is an apocalyptic number.

It is an amenable number.

66954901 is a deficient number, since it is larger than the sum of its proper divisors (5150391).

66954901 is a wasteful number, since it uses less digits than its factorization.

66954901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150390.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 66954901 is about 8182.5974482434. The cubic root of 66954901 is about 406.0636593620.

The spelling of 66954901 in words is "sixty-six million, nine hundred fifty-four thousand, nine hundred one".