42780066891 has 32 divisors (see below), whose sum is σ = 60712743168. Its totient is φ = 26701608960.

The previous prime is 42780066881. The next prime is 42780066937. The reversal of 42780066891 is 19866008724.

It is not a de Polignac number, because 42780066891 - 2⁵ = 42780066859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (42780066811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18226380 + ... + 18228726.

It is an arithmetic number, because the mean of its divisors is an integer number (1897273224).

Almost surely, 2^42780066891 is an apocalyptic number.

42780066891 is a deficient number, since it is larger than the sum of its proper divisors (17932676277).

42780066891 is a wasteful number, since it uses less digits than its factorization.

42780066891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 42780066891 in words is "forty-two billion, seven hundred eighty million, sixty-six thousand, eight hundred ninety-one".