66102681 has 12 divisors (see below), whose sum is σ = 93627632. Its totient is φ = 41475648.

The previous prime is 66102679. The next prime is 66102689. The reversal of 66102681 is 18620166.

It is not a de Polignac number, because 66102681 - 2¹ = 66102679 is a prime.

It is a super-2 number, since 2×66102681² = 8739128870775522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66102689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37255 + ... + 38988.

Almost surely, 2^66102681 is an apocalyptic number.

It is an amenable number.

66102681 is a deficient number, since it is larger than the sum of its proper divisors (27524951).

66102681 is a wasteful number, since it uses less digits than its factorization.

66102681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76280 (or 76263 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 66102681 is about 8130.3555272817. The cubic root of 66102681 is about 404.3334685060. Note that the first 3 decimals are identical.

The spelling of 66102681 in words is "sixty-six million, one hundred two thousand, six hundred eighty-one".