42647642417 has 2 divisors, whose sum is σ = 42647642418. Its totient is φ = 42647642416.

The previous prime is 42647642393. The next prime is 42647642489. The reversal of 42647642417 is 71424674624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33751568656 + 8896073761 = 183716^2 + 94319^2 .

It is a cyclic number.

It is not a de Polignac number, because 42647642417 - 2¹⁸ = 42647380273 is a prime.

It is not a weakly prime, because it can be changed into another prime (42647642017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21323821208 + 21323821209.

It is an arithmetic number, because the mean of its divisors is an integer number (21323821209).

Almost surely, 2^42647642417 is an apocalyptic number.

It is an amenable number.

42647642417 is a deficient number, since it is larger than the sum of its proper divisors (1).

42647642417 is an equidigital number, since it uses as much as digits as its factorization.

42647642417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 47.

The spelling of 42647642417 in words is "forty-two billion, six hundred forty-seven million, six hundred forty-two thousand, four hundred seventeen".