42497856397 has 2 divisors, whose sum is σ = 42497856398. Its totient is φ = 42497856396.

The previous prime is 42497856319. The next prime is 42497856421. The reversal of 42497856397 is 79365879424.

42497856397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33520483396 + 8977373001 = 183086^2 + 94749^2 .

It is a cyclic number.

It is not a de Polignac number, because 42497856397 - 2³¹ = 40350372749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42497857397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21248928198 + 21248928199.

It is an arithmetic number, because the mean of its divisors is an integer number (21248928199).

Almost surely, 2^42497856397 is an apocalyptic number.

It is an amenable number.

42497856397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42497856397 is an equidigital number, since it uses as much as digits as its factorization.

42497856397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 64.

The spelling of 42497856397 in words is "forty-two billion, four hundred ninety-seven million, eight hundred fifty-six thousand, three hundred ninety-seven".