66743039 has 16 divisors (see below), whose sum is σ = 75527424. Its totient is φ = 58449600.

The previous prime is 66743011. The next prime is 66743041. The reversal of 66743039 is 93034766.

It is a happy number.

It is not a de Polignac number, because 66743039 - 2¹² = 66738943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66742993 and 66743011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66743939) 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, 36542 + ... + 38324.

It is an arithmetic number, because the mean of its divisors is an integer number (4720464).

Almost surely, 2^66743039 is an apocalyptic number.

66743039 is a deficient number, since it is larger than the sum of its proper divisors (8784385).

66743039 is a wasteful number, since it uses less digits than its factorization.

66743039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 66743039 is about 8169.6413017953. The cubic root of 66743039 is about 405.6349112688.

The spelling of 66743039 in words is "sixty-six million, seven hundred forty-three thousand, thirty-nine".