66975945 has 8 divisors (see below), whose sum is σ = 107161536. Its totient is φ = 35720496.

The previous prime is 66975943. The next prime is 66975949. The reversal of 66975945 is 54957966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66975945 - 2¹ = 66975943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66975943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2232517 + ... + 2232546.

It is an arithmetic number, because the mean of its divisors is an integer number (13395192).

Almost surely, 2^66975945 is an apocalyptic number.

It is an amenable number.

66975945 is a deficient number, since it is larger than the sum of its proper divisors (40185591).

66975945 is a wasteful number, since it uses less digits than its factorization.

66975945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465071.

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

The square root of 66975945 is about 8183.8832469678. The cubic root of 66975945 is about 406.1061969926.

The spelling of 66975945 in words is "sixty-six million, nine hundred seventy-five thousand, nine hundred forty-five".