42165554723 has 2 divisors, whose sum is σ = 42165554724. Its totient is φ = 42165554722.

The previous prime is 42165554579. The next prime is 42165554759. The reversal of 42165554723 is 32745556124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42165554723 - 2¹² = 42165550627 is a prime.

It is not a weakly prime, because it can be changed into another prime (42165554323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21082777361 + 21082777362.

It is an arithmetic number, because the mean of its divisors is an integer number (21082777362).

Almost surely, 2^42165554723 is an apocalyptic number.

42165554723 is a deficient number, since it is larger than the sum of its proper divisors (1).

42165554723 is an equidigital number, since it uses as much as digits as its factorization.

42165554723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 44.

The spelling of 42165554723 in words is "forty-two billion, one hundred sixty-five million, five hundred fifty-four thousand, seven hundred twenty-three".