642728330707 has 2 divisors, whose sum is σ = 642728330708. Its totient is φ = 642728330706.

The previous prime is 642728330689. The next prime is 642728330711. The reversal of 642728330707 is 707033827246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642728330707 - 2¹⁹ = 642727806419 is a prime.

It is not a weakly prime, because it can be changed into another prime (642728330767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321364165353 + 321364165354.

It is an arithmetic number, because the mean of its divisors is an integer number (321364165354).

Almost surely, 2^642728330707 is an apocalyptic number.

642728330707 is a deficient number, since it is larger than the sum of its proper divisors (1).

642728330707 is an equidigital number, since it uses as much as digits as its factorization.

642728330707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 49.

The spelling of 642728330707 in words is "six hundred forty-two billion, seven hundred twenty-eight million, three hundred thirty thousand, seven hundred seven".