66039742 has 16 divisors (see below), whose sum is σ = 100965600. Its totient is φ = 32389632.

The previous prime is 66039671. The next prime is 66039751. The reversal of 66039742 is 24793066.

It is a super-2 number, since 2×66039742² = 8722495046853128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27918 + ... + 30190.

It is an arithmetic number, because the mean of its divisors is an integer number (6310350).

Almost surely, 2^66039742 is an apocalyptic number.

66039742 is a deficient number, since it is larger than the sum of its proper divisors (34925858).

66039742 is a wasteful number, since it uses less digits than its factorization.

66039742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 66039742 is about 8126.4839875557. The cubic root of 66039742 is about 404.2051004133.

The spelling of 66039742 in words is "sixty-six million, thirty-nine thousand, seven hundred forty-two".