42040139951 has 2 divisors, whose sum is σ = 42040139952. Its totient is φ = 42040139950.

The previous prime is 42040139929. The next prime is 42040140007. The reversal of 42040139951 is 15993104024.

42040139951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42040139951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42040159951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21020069975 + 21020069976.

It is an arithmetic number, because the mean of its divisors is an integer number (21020069976).

Almost surely, 2^42040139951 is an apocalyptic number.

42040139951 is a deficient number, since it is larger than the sum of its proper divisors (1).

42040139951 is an equidigital number, since it uses as much as digits as its factorization.

42040139951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 42040139951 in words is "forty-two billion, forty million, one hundred thirty-nine thousand, nine hundred fifty-one".