642767296291 has 2 divisors, whose sum is σ = 642767296292. Its totient is φ = 642767296290.

The previous prime is 642767296279. The next prime is 642767296313. The reversal of 642767296291 is 192692767246.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642767296291 is a prime.

It is not a weakly prime, because it can be changed into another prime (642767296271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321383648145 + 321383648146.

It is an arithmetic number, because the mean of its divisors is an integer number (321383648146).

Almost surely, 2^642767296291 is an apocalyptic number.

642767296291 is a deficient number, since it is larger than the sum of its proper divisors (1).

642767296291 is an equidigital number, since it uses as much as digits as its factorization.

642767296291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 61.

The spelling of 642767296291 in words is "six hundred forty-two billion, seven hundred sixty-seven million, two hundred ninety-six thousand, two hundred ninety-one".