42377117561 has 2 divisors, whose sum is σ = 42377117562. Its totient is φ = 42377117560.

The previous prime is 42377117539. The next prime is 42377117617. The reversal of 42377117561 is 16571177324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41271954025 + 1105163536 = 203155^2 + 33244^2 .

It is a cyclic number.

It is not a de Polignac number, because 42377117561 - 2¹⁴ = 42377101177 is a prime.

It is not a weakly prime, because it can be changed into another prime (42377117161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21188558780 + 21188558781.

It is an arithmetic number, because the mean of its divisors is an integer number (21188558781).

Almost surely, 2^42377117561 is an apocalyptic number.

It is an amenable number.

42377117561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42377117561 is an equidigital number, since it uses as much as digits as its factorization.

42377117561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246960, while the sum is 44.

The spelling of 42377117561 in words is "forty-two billion, three hundred seventy-seven million, one hundred seventeen thousand, five hundred sixty-one".