42165625646 has 8 divisors (see below), whose sum is σ = 63250108320. Its totient is φ = 21082256208.

The previous prime is 42165625631. The next prime is 42165625651. The reversal of 42165625646 is 64652656124.

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

It is a super-2 number, since 2×42165625646² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42165625646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176111 + ... + 339626.

It is an arithmetic number, because the mean of its divisors is an integer number (7906263540).

Almost surely, 2^42165625646 is an apocalyptic number.

42165625646 is a deficient number, since it is larger than the sum of its proper divisors (21084482674).

42165625646 is a wasteful number, since it uses less digits than its factorization.

42165625646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556618.

The product of its digits is 2073600, while the sum is 47.

The spelling of 42165625646 in words is "forty-two billion, one hundred sixty-five million, six hundred twenty-five thousand, six hundred forty-six".