40042061243 has 2 divisors, whose sum is σ = 40042061244. Its totient is φ = 40042061242.

The previous prime is 40042061221. The next prime is 40042061249. The reversal of 40042061243 is 34216024004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40042061243 - 2¹⁴ = 40042044859 is a prime.

It is not a weakly prime, because it can be changed into another prime (40042061249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021030621 + 20021030622.

It is an arithmetic number, because the mean of its divisors is an integer number (20021030622).

Almost surely, 2^40042061243 is an apocalyptic number.

40042061243 is a deficient number, since it is larger than the sum of its proper divisors (1).

40042061243 is an equidigital number, since it uses as much as digits as its factorization.

40042061243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 40042061243 its reverse (34216024004), we get a palindrome (74258085247).

The spelling of 40042061243 in words is "forty billion, forty-two million, sixty-one thousand, two hundred forty-three".