42505666671 has 8 divisors (see below), whose sum is σ = 61033777840. Its totient is φ = 26157333312.

The previous prime is 42505666667. The next prime is 42505666673. The reversal of 42505666671 is 17666650524.

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

It is not a de Polignac number, because 42505666671 - 2² = 42505666667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42505666671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42505666673) 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, 544944406 + ... + 544944483.

It is an arithmetic number, because the mean of its divisors is an integer number (7629222230).

Almost surely, 2^42505666671 is an apocalyptic number.

42505666671 is a deficient number, since it is larger than the sum of its proper divisors (18528111169).

42505666671 is a wasteful number, since it uses less digits than its factorization.

42505666671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089888905.

The product of its (nonzero) digits is 1814400, while the sum is 48.

The spelling of 42505666671 in words is "forty-two billion, five hundred five million, six hundred sixty-six thousand, six hundred seventy-one".