42366528781 has 4 divisors (see below), whose sum is σ = 43084605600. Its totient is φ = 41648451964.

The previous prime is 42366528779. The next prime is 42366528791. The reversal of 42366528781 is 18782566324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42366528781 - 2¹ = 42366528779 is a prime.

It is a super-2 number, since 2×42366528781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42366528761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359038321 + ... + 359038438.

It is an arithmetic number, because the mean of its divisors is an integer number (10771151400).

Almost surely, 2^42366528781 is an apocalyptic number.

It is an amenable number.

42366528781 is a deficient number, since it is larger than the sum of its proper divisors (718076819).

42366528781 is an equidigital number, since it uses as much as digits as its factorization.

42366528781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718076818.

The product of its digits is 3870720, while the sum is 52.

The spelling of 42366528781 in words is "forty-two billion, three hundred sixty-six million, five hundred twenty-eight thousand, seven hundred eighty-one".