642650347 has 2 divisors, whose sum is σ = 642650348. Its totient is φ = 642650346.

The previous prime is 642650341. The next prime is 642650363. The reversal of 642650347 is 743056246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642650347 - 2³ = 642650339 is a prime.

It is not a weakly prime, because it can be changed into another prime (642650341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321325173 + 321325174.

It is an arithmetic number, because the mean of its divisors is an integer number (321325174).

Almost surely, 2^642650347 is an apocalyptic number.

642650347 is a deficient number, since it is larger than the sum of its proper divisors (1).

642650347 is an equidigital number, since it uses as much as digits as its factorization.

642650347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 37.

The square root of 642650347 is about 25350.5492445430. The cubic root of 642650347 is about 862.9618209253.

The spelling of 642650347 in words is "six hundred forty-two million, six hundred fifty thousand, three hundred forty-seven".