42665645 has 8 divisors (see below), whose sum is σ = 55853280. Its totient is φ = 31029520.

The previous prime is 42665627. The next prime is 42665663. The reversal of 42665645 is 54656624.

It is an interprime number because it is at equal distance from previous prime (42665627) and next prime (42665663).

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

It is a de Polignac number, because none of the positive numbers 2^k-42665645 is a prime.

It is a super-3 number, since 3×42665645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42665599 and 42665608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387815 + ... + 387924.

It is an arithmetic number, because the mean of its divisors is an integer number (6981660).

Almost surely, 2^42665645 is an apocalyptic number.

It is an amenable number.

42665645 is a deficient number, since it is larger than the sum of its proper divisors (13187635).

42665645 is a wasteful number, since it uses less digits than its factorization.

42665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775755.

The product of its digits is 172800, while the sum is 38.

The square root of 42665645 is about 6531.8944418905. The cubic root of 42665645 is about 349.4293967846.

The spelling of 42665645 in words is "forty-two million, six hundred sixty-five thousand, six hundred forty-five".