42780125671 has 4 divisors (see below), whose sum is σ = 42801400744. Its totient is φ = 42758850600.

The previous prime is 42780125627. The next prime is 42780125693. The reversal of 42780125671 is 17652108724.

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 42780125671 - 2¹¹ = 42780123623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42780195671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10634520 + ... + 10638541.

It is an arithmetic number, because the mean of its divisors is an integer number (10700350186).

Almost surely, 2^42780125671 is an apocalyptic number.

42780125671 is a deficient number, since it is larger than the sum of its proper divisors (21275073).

42780125671 is a wasteful number, since it uses less digits than its factorization.

42780125671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21275072.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 42780125671 in words is "forty-two billion, seven hundred eighty million, one hundred twenty-five thousand, six hundred seventy-one".