642658699 has 2 divisors, whose sum is σ = 642658700. Its totient is φ = 642658698.

The previous prime is 642658697. The next prime is 642658727. The reversal of 642658699 is 996856246.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642658699 - 2¹ = 642658697 is a prime.

Together with 642658697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (642658697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321329349 + 321329350.

It is an arithmetic number, because the mean of its divisors is an integer number (321329350).

Almost surely, 2^642658699 is an apocalyptic number.

642658699 is a deficient number, since it is larger than the sum of its proper divisors (1).

642658699 is an equidigital number, since it uses as much as digits as its factorization.

642658699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 55.

The square root of 642658699 is about 25350.7139741665. The cubic root of 642658699 is about 862.9655593117.

The spelling of 642658699 in words is "six hundred forty-two million, six hundred fifty-eight thousand, six hundred ninety-nine".