66781486 has 8 divisors (see below), whose sum is σ = 100553904. Its totient is φ = 33263520.

The previous prime is 66781483. The next prime is 66781487. The reversal of 66781486 is 68418766.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66781483) 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, 62955 + ... + 64006.

It is an arithmetic number, because the mean of its divisors is an integer number (12569238).

Almost surely, 2^66781486 is an apocalyptic number.

66781486 is a deficient number, since it is larger than the sum of its proper divisors (33772418).

66781486 is a wasteful number, since it uses less digits than its factorization.

66781486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127226.

The product of its digits is 387072, while the sum is 46.

The square root of 66781486 is about 8171.9940039136. The cubic root of 66781486 is about 405.7127843178.

The spelling of 66781486 in words is "sixty-six million, seven hundred eighty-one thousand, four hundred eighty-six".