642474060281 has 2 divisors, whose sum is σ = 642474060282. Its totient is φ = 642474060280.

The previous prime is 642474060257. The next prime is 642474060287. The reversal of 642474060281 is 182060474246.

642474060281 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., 498131054656 + 144343005625 = 705784^2 + 379925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642474060281 is a prime.

It is a super-2 number, since 2×642474060281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (642474060287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321237030140 + 321237030141.

It is an arithmetic number, because the mean of its divisors is an integer number (321237030141).

Almost surely, 2^642474060281 is an apocalyptic number.

It is an amenable number.

642474060281 is a deficient number, since it is larger than the sum of its proper divisors (1).

642474060281 is an equidigital number, since it uses as much as digits as its factorization.

642474060281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 516096, while the sum is 44.

The spelling of 642474060281 in words is "six hundred forty-two billion, four hundred seventy-four million, sixty thousand, two hundred eighty-one".