42665045 has 4 divisors (see below), whose sum is σ = 51198060. Its totient is φ = 34132032.

The previous prime is 42665041. The next prime is 42665057. The reversal of 42665045 is 54056624.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21743569 + 20921476 = 4663^2 + 4574^2 .

It is a cyclic number.

It is not a de Polignac number, because 42665045 - 2² = 42665041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42665041) 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, 4266500 + ... + 4266509.

It is an arithmetic number, because the mean of its divisors is an integer number (12799515).

Almost surely, 2^42665045 is an apocalyptic number.

It is an amenable number.

42665045 is a deficient number, since it is larger than the sum of its proper divisors (8533015).

42665045 is an equidigital number, since it uses as much as digits as its factorization.

42665045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8533014.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 42665045 is about 6531.8485132465. The cubic root of 42665045 is about 349.4277587874.

The spelling of 42665045 in words is "forty-two million, six hundred sixty-five thousand, forty-five".