642516467 has 2 divisors, whose sum is σ = 642516468. Its totient is φ = 642516466.

The previous prime is 642516451. The next prime is 642516473. The reversal of 642516467 is 764615246.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642516467 - 2⁴ = 642516451 is a prime.

It is not a weakly prime, because it can be changed into another prime (642516487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321258233 + 321258234.

It is an arithmetic number, because the mean of its divisors is an integer number (321258234).

Almost surely, 2^642516467 is an apocalyptic number.

642516467 is a deficient number, since it is larger than the sum of its proper divisors (1).

642516467 is an equidigital number, since it uses as much as digits as its factorization.

642516467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 642516467 is about 25347.9085330526. The cubic root of 642516467 is about 862.9018913162.

The spelling of 642516467 in words is "six hundred forty-two million, five hundred sixteen thousand, four hundred sixty-seven".