66541698 has 12 divisors (see below), whose sum is σ = 144173718. Its totient is φ = 22180560.

The previous prime is 66541693. The next prime is 66541703. The reversal of 66541698 is 89614566.

It is an interprime number because it is at equal distance from previous prime (66541693) and next prime (66541703).

It can be written as a sum of positive squares in only one way, i.e., 61732449 + 4809249 = 7857^2 + 2193^2 .

It is not an unprimeable number, because it can be changed into a prime (66541693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1848363 + ... + 1848398.

Almost surely, 2^66541698 is an apocalyptic number.

66541698 is an abundant number, since it is smaller than the sum of its proper divisors (77632020).

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

66541698 is a wasteful number, since it uses less digits than its factorization.

66541698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3696769 (or 3696766 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66541698 is about 8157.3094829116. The cubic root of 66541698 is about 405.2266130039.

The spelling of 66541698 in words is "sixty-six million, five hundred forty-one thousand, six hundred ninety-eight".