642919527479 has 2 divisors, whose sum is σ = 642919527480. Its totient is φ = 642919527478.

The previous prime is 642919527451. The next prime is 642919527611. The reversal of 642919527479 is 974725919246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642919527479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642919523479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321459763739 + 321459763740.

It is an arithmetic number, because the mean of its divisors is an integer number (321459763740).

Almost surely, 2^642919527479 is an apocalyptic number.

642919527479 is a deficient number, since it is larger than the sum of its proper divisors (1).

642919527479 is an equidigital number, since it uses as much as digits as its factorization.

642919527479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68584320, while the sum is 65.

The spelling of 642919527479 in words is "six hundred forty-two billion, nine hundred nineteen million, five hundred twenty-seven thousand, four hundred seventy-nine".