66131066 has 4 divisors (see below), whose sum is σ = 99196602. Its totient is φ = 33065532.

The previous prime is 66131041. The next prime is 66131081. The reversal of 66131066 is 66013166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65141041 + 990025 = 8071^2 + 995^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16532765 + ... + 16532768.

Almost surely, 2^66131066 is an apocalyptic number.

66131066 is a deficient number, since it is larger than the sum of its proper divisors (33065536).

66131066 is a wasteful number, since it uses less digits than its factorization.

66131066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33065535.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66131066 is about 8132.1009585469. The cubic root of 66131066 is about 404.3913348585.

The spelling of 66131066 in words is "sixty-six million, one hundred thirty-one thousand, sixty-six".