642854575457 has 2 divisors, whose sum is σ = 642854575458. Its totient is φ = 642854575456.

The previous prime is 642854575427. The next prime is 642854575469. The reversal of 642854575457 is 754575458246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637576698256 + 5277877201 = 798484^2 + 72649^2 .

It is a cyclic number.

It is not a de Polignac number, because 642854575457 - 2⁶ = 642854575393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642854575457.

It is not a weakly prime, because it can be changed into another prime (642854575427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321427287728 + 321427287729.

It is an arithmetic number, because the mean of its divisors is an integer number (321427287729).

Almost surely, 2^642854575457 is an apocalyptic number.

It is an amenable number.

642854575457 is a deficient number, since it is larger than the sum of its proper divisors (1).

642854575457 is an equidigital number, since it uses as much as digits as its factorization.

642854575457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160000, while the sum is 62.

The spelling of 642854575457 in words is "six hundred forty-two billion, eight hundred fifty-four million, five hundred seventy-five thousand, four hundred fifty-seven".