42995423781 has 20 divisors (see below), whose sum is σ = 65186362912. Its totient is φ = 28235797128.

The previous prime is 42995423771. The next prime is 42995423789. The reversal of 42995423781 is 18732459924.

42995423781 is a `hidden beast` number, since 4 + 2 + 99 + 542 + 3 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 42995423781 - 2⁵ = 42995423749 is a prime.

It is a super-2 number, since 2×42995423781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42995423789) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3955825 + ... + 3966678.

Almost surely, 2^42995423781 is an apocalyptic number.

It is an amenable number.

42995423781 is a deficient number, since it is larger than the sum of its proper divisors (22190939131).

42995423781 is an equidigital number, since it uses as much as digits as its factorization.

42995423781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7922582 (or 7922573 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 42995423781 in words is "forty-two billion, nine hundred ninety-five million, four hundred twenty-three thousand, seven hundred eighty-one".