42820360781 has 16 divisors (see below), whose sum is σ = 49227984960. Its totient is φ = 36836570880.

The previous prime is 42820360777. The next prime is 42820360841. The reversal of 42820360781 is 18706302824.

It is a cyclic number.

It is not a de Polignac number, because 42820360781 - 2² = 42820360777 is a prime.

It is a super-2 number, since 2×42820360781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42820360741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66485 + ... + 300101.

It is an arithmetic number, because the mean of its divisors is an integer number (3076749060).

Almost surely, 2^42820360781 is an apocalyptic number.

It is an amenable number.

42820360781 is a deficient number, since it is larger than the sum of its proper divisors (6407624179).

42820360781 is a wasteful number, since it uses less digits than its factorization.

42820360781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234524.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 42820360781 in words is "forty-two billion, eight hundred twenty million, three hundred sixty thousand, seven hundred eighty-one".