66540842 has 8 divisors (see below), whose sum is σ = 100043076. Its totient is φ = 33193152.

The previous prime is 66540833. The next prime is 66540847. The reversal of 66540842 is 24804566.

It can be written as a sum of positive squares in 2 ways, for example, as 62742241 + 3798601 = 7921^2 + 1949^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66540847) 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, 37553 + ... + 39284.

Almost surely, 2^66540842 is an apocalyptic number.

66540842 is a deficient number, since it is larger than the sum of its proper divisors (33502234).

66540842 is a wasteful number, since it uses less digits than its factorization.

66540842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77272.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 66540842 is about 8157.2570144626. The cubic root of 66540842 is about 405.2248753694.

The spelling of 66540842 in words is "sixty-six million, five hundred forty thousand, eight hundred forty-two".