42780074081 has 16 divisors (see below), whose sum is σ = 44271456768. Its totient is φ = 41311670400.

The previous prime is 42780074053. The next prime is 42780074087. The reversal of 42780074081 is 18047008724.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42780074081 is a prime.

It is a super-2 number, since 2×42780074081² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42780074087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2122256 + ... + 2142318.

It is an arithmetic number, because the mean of its divisors is an integer number (2766966048).

Almost surely, 2^42780074081 is an apocalyptic number.

42780074081 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42780074081 is a deficient number, since it is larger than the sum of its proper divisors (1491382687).

42780074081 is a wasteful number, since it uses less digits than its factorization.

42780074081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20632.

The product of its (nonzero) digits is 100352, while the sum is 41.

The spelling of 42780074081 in words is "forty-two billion, seven hundred eighty million, seventy-four thousand, eighty-one".