642745627 has 2 divisors, whose sum is σ = 642745628. Its totient is φ = 642745626.

The previous prime is 642745601. The next prime is 642745651. The reversal of 642745627 is 726547246.

642745627 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642745627 - 2²³ = 634357019 is a prime.

It is not a weakly prime, because it can be changed into another prime (642745687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321372813 + 321372814.

It is an arithmetic number, because the mean of its divisors is an integer number (321372814).

Almost surely, 2^642745627 is an apocalyptic number.

642745627 is a deficient number, since it is larger than the sum of its proper divisors (1).

642745627 is an equidigital number, since it uses as much as digits as its factorization.

642745627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 43.

The square root of 642745627 is about 25352.4284241175. The cubic root of 642745627 is about 863.0044666862.

The spelling of 642745627 in words is "six hundred forty-two million, seven hundred forty-five thousand, six hundred twenty-seven".