66782749 has 16 divisors (see below), whose sum is σ = 78459840. Its totient is φ = 56162560.

The previous prime is 66782699. The next prime is 66782753. The reversal of 66782749 is 94728766.

It is not a de Polignac number, because 66782749 - 2¹³ = 66774557 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 (66782789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8007 + ... + 14059.

It is an arithmetic number, because the mean of its divisors is an integer number (4903740).

Almost surely, 2^66782749 is an apocalyptic number.

It is an amenable number.

66782749 is a deficient number, since it is larger than the sum of its proper divisors (11677091).

66782749 is a wasteful number, since it uses less digits than its factorization.

66782749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6140.

The product of its digits is 1016064, while the sum is 49.

The square root of 66782749 is about 8172.0712796696. The cubic root of 66782749 is about 405.7153419728.

The spelling of 66782749 in words is "sixty-six million, seven hundred eighty-two thousand, seven hundred forty-nine".