642697603 has 2 divisors, whose sum is σ = 642697604. Its totient is φ = 642697602.

The previous prime is 642697547. The next prime is 642697639. The reversal of 642697603 is 306796246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642697603 - 2²¹ = 640600451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642697603.

It is not a weakly prime, because it can be changed into another prime (642697703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321348801 + 321348802.

It is an arithmetic number, because the mean of its divisors is an integer number (321348802).

Almost surely, 2^642697603 is an apocalyptic number.

642697603 is a deficient number, since it is larger than the sum of its proper divisors (1).

642697603 is an equidigital number, since it uses as much as digits as its factorization.

642697603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 642697603 is about 25351.4812782212. The cubic root of 642697603 is about 862.9829724605.

The spelling of 642697603 in words is "six hundred forty-two million, six hundred ninety-seven thousand, six hundred three".