66495975 has 48 divisors (see below), whose sum is σ = 135324672. Its totient is φ = 28056960.

The previous prime is 66495943. The next prime is 66495977. The reversal of 66495975 is 57959466.

It is not a de Polignac number, because 66495975 - 2⁵ = 66495943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66495977) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1954 + ... + 11696.

It is an arithmetic number, because the mean of its divisors is an integer number (2819264).

Almost surely, 2^66495975 is an apocalyptic number.

66495975 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66495975 is an abundant number, since it is smaller than the sum of its proper divisors (68828697).

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

66495975 is a wasteful number, since it uses less digits than its factorization.

66495975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9776 (or 9771 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 51.

The square root of 66495975 is about 8154.5064228315. The cubic root of 66495975 is about 405.1337768707.

The spelling of 66495975 in words is "sixty-six million, four hundred ninety-five thousand, nine hundred seventy-five".