66837401 has 4 divisors (see below), whose sum is σ = 66855204. Its totient is φ = 66819600.

The previous prime is 66837371. The next prime is 66837403. The reversal of 66837401 is 10473866.

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 47265625 + 19571776 = 6875^2 + 4424^2 .

It is a cyclic number.

It is not a de Polignac number, because 66837401 - 2¹⁰ = 66836377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66837403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830 + ... + 11591.

It is an arithmetic number, because the mean of its divisors is an integer number (16713801).

Almost surely, 2^66837401 is an apocalyptic number.

It is an amenable number.

66837401 is a deficient number, since it is larger than the sum of its proper divisors (17803).

66837401 is a wasteful number, since it uses less digits than its factorization.

66837401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17802.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 66837401 is about 8175.4144237464. The cubic root of 66837401 is about 405.8259848631.

The spelling of 66837401 in words is "sixty-six million, eight hundred thirty-seven thousand, four hundred one".