42156801899 has 2 divisors, whose sum is σ = 42156801900. Its totient is φ = 42156801898.

The previous prime is 42156801889. The next prime is 42156801923. The reversal of 42156801899 is 99810865124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42156801899 - 2¹² = 42156797803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42156801899.

It is not a weakly prime, because it can be changed into another prime (42156801889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21078400949 + 21078400950.

It is an arithmetic number, because the mean of its divisors is an integer number (21078400950).

Almost surely, 2^42156801899 is an apocalyptic number.

42156801899 is a deficient number, since it is larger than the sum of its proper divisors (1).

42156801899 is an equidigital number, since it uses as much as digits as its factorization.

42156801899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The spelling of 42156801899 in words is "forty-two billion, one hundred fifty-six million, eight hundred one thousand, eight hundred ninety-nine".