66780849 has 16 divisors (see below), whose sum is σ = 91384832. Its totient is φ = 43355088.

The previous prime is 66780827. The next prime is 66780871. The reversal of 66780849 is 94808766.

It is an interprime number because it is at equal distance from previous prime (66780827) and next prime (66780871).

It is not a de Polignac number, because 66780849 - 2⁵ = 66780817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66780798 and 66780807.

It is not an unprimeable number, because it can be changed into a prime (66780899) 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 15 ways as a sum of consecutive naturals, for example, 62292 + ... + 63354.

It is an arithmetic number, because the mean of its divisors is an integer number (5711552).

Almost surely, 2^66780849 is an apocalyptic number.

It is an amenable number.

66780849 is a deficient number, since it is larger than the sum of its proper divisors (24603983).

66780849 is a wasteful number, since it uses less digits than its factorization.

66780849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 66780849 is about 8171.9550292448. The cubic root of 66780849 is about 405.7114943401.

The spelling of 66780849 in words is "sixty-six million, seven hundred eighty thousand, eight hundred forty-nine".