427750429599781 has 2 divisors, whose sum is σ = 427750429599782. Its totient is φ = 427750429599780.

The previous prime is 427750429599737. The next prime is 427750429599859. The reversal of 427750429599781 is 187995924057724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344430319439556 + 83320110160225 = 18558834^2 + 9127985^2 .

It is a cyclic number.

It is not a de Polignac number, because 427750429599781 - 2¹⁹ = 427750429075493 is a prime.

It is a super-2 number, since 2×427750429599781² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427750429899781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213875214799890 + 213875214799891.

It is an arithmetic number, because the mean of its divisors is an integer number (213875214799891).

Almost surely, 2^{427750429599781} is an apocalyptic number.

It is an amenable number.

427750429599781 is a deficient number, since it is larger than the sum of its proper divisors (1).

427750429599781 is an equidigital number, since it uses as much as digits as its factorization.

427750429599781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200601600, while the sum is 79.

The spelling of 427750429599781 in words is "four hundred twenty-seven trillion, seven hundred fifty billion, four hundred twenty-nine million, five hundred ninety-nine thousand, seven hundred eighty-one".