42776495197 has 2 divisors, whose sum is σ = 42776495198. Its totient is φ = 42776495196.

The previous prime is 42776495147. The next prime is 42776495207. The reversal of 42776495197 is 79159467724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32210916676 + 10565578521 = 179474^2 + 102789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42776495197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42776495147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21388247598 + 21388247599.

It is an arithmetic number, because the mean of its divisors is an integer number (21388247599).

Almost surely, 2^42776495197 is an apocalyptic number.

It is an amenable number.

42776495197 is a deficient number, since it is larger than the sum of its proper divisors (1).

42776495197 is an equidigital number, since it uses as much as digits as its factorization.

42776495197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26671680, while the sum is 61.

The spelling of 42776495197 in words is "forty-two billion, seven hundred seventy-six million, four hundred ninety-five thousand, one hundred ninety-seven".