642510762877 has 2 divisors, whose sum is σ = 642510762878. Its totient is φ = 642510762876.

The previous prime is 642510762853. The next prime is 642510762911. The reversal of 642510762877 is 778267015246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 593833607236 + 48677155641 = 770606^2 + 220629^2 .

It is a cyclic number.

It is not a de Polignac number, because 642510762877 - 2¹⁵ = 642510730109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642510762847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321255381438 + 321255381439.

It is an arithmetic number, because the mean of its divisors is an integer number (321255381439).

Almost surely, 2^642510762877 is an apocalyptic number.

It is an amenable number.

642510762877 is a deficient number, since it is larger than the sum of its proper divisors (1).

642510762877 is an equidigital number, since it uses as much as digits as its factorization.

642510762877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7902720, while the sum is 55.

The spelling of 642510762877 in words is "six hundred forty-two billion, five hundred ten million, seven hundred sixty-two thousand, eight hundred seventy-seven".