66820737 has 4 divisors (see below), whose sum is σ = 89094320. Its totient is φ = 44547156.

The previous prime is 66820711. The next prime is 66820759. The reversal of 66820737 is 73702866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66820737 - 2⁷ = 66820609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66820695 and 66820704.

It is not an unprimeable number, because it can be changed into a prime (66860737) 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, 11136787 + ... + 11136792.

It is an arithmetic number, because the mean of its divisors is an integer number (22273580).

Almost surely, 2^66820737 is an apocalyptic number.

It is an amenable number.

66820737 is a deficient number, since it is larger than the sum of its proper divisors (22273583).

66820737 is a wasteful number, since it uses less digits than its factorization.

66820737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22273582.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 66820737 is about 8174.3952069863. The cubic root of 66820737 is about 405.7922550142.

The spelling of 66820737 in words is "sixty-six million, eight hundred twenty thousand, seven hundred thirty-seven".