66495081 has 4 divisors (see below), whose sum is σ = 88660112. Its totient is φ = 44330052.

The previous prime is 66495073. The next prime is 66495089. The reversal of 66495081 is 18059466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (66495073) and next prime (66495089).

It is not a de Polignac number, because 66495081 - 2³ = 66495073 is a prime.

It is a super-2 number, since 2×66495081² = 8843191594393122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66495089) 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, 11082511 + ... + 11082516.

It is an arithmetic number, because the mean of its divisors is an integer number (22165028).

Almost surely, 2^66495081 is an apocalyptic number.

It is an amenable number.

66495081 is a deficient number, since it is larger than the sum of its proper divisors (22165031).

66495081 is a wasteful number, since it uses less digits than its factorization.

66495081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22165030.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 66495081 is about 8154.4516063314. The cubic root of 66495081 is about 405.1319612660.

The spelling of 66495081 in words is "sixty-six million, four hundred ninety-five thousand, eighty-one".