66490854 has 16 divisors (see below), whose sum is σ = 135162480. Its totient is φ = 21800160.

The previous prime is 66490847. The next prime is 66490873. The reversal of 66490854 is 45809466.

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, 90469 + ... + 91200.

It is an arithmetic number, because the mean of its divisors is an integer number (8447655).

Almost surely, 2^66490854 is an apocalyptic number.

66490854 is an abundant number, since it is smaller than the sum of its proper divisors (68671626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66490854 is a wasteful number, since it uses less digits than its factorization.

66490854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181735.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 66490854 is about 8154.1924186274. The cubic root of 66490854 is about 405.1233765253.

The spelling of 66490854 in words is "sixty-six million, four hundred ninety thousand, eight hundred fifty-four".