42665515 has 4 divisors (see below), whose sum is σ = 51198624. Its totient is φ = 34132408.

The previous prime is 42665489. The next prime is 42665527. The reversal of 42665515 is 51556624.

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

It is a cyclic number.

It is not a de Polignac number, because 42665515 - 2¹³ = 42657323 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4266547 + ... + 4266556.

It is an arithmetic number, because the mean of its divisors is an integer number (12799656).

Almost surely, 2^42665515 is an apocalyptic number.

42665515 is a deficient number, since it is larger than the sum of its proper divisors (8533109).

42665515 is an equidigital number, since it uses as much as digits as its factorization.

42665515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8533108.

The product of its digits is 36000, while the sum is 34.

The square root of 42665515 is about 6531.8844907117. The cubic root of 42665515 is about 349.4290418865.

The spelling of 42665515 in words is "forty-two million, six hundred sixty-five thousand, five hundred fifteen".