642515110451 has 2 divisors, whose sum is σ = 642515110452. Its totient is φ = 642515110450.

The previous prime is 642515110439. The next prime is 642515110511. The reversal of 642515110451 is 154011515246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642515110451 is a prime.

It is not a weakly prime, because it can be changed into another prime (642515110351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321257555225 + 321257555226.

It is an arithmetic number, because the mean of its divisors is an integer number (321257555226).

Almost surely, 2^642515110451 is an apocalyptic number.

642515110451 is a deficient number, since it is larger than the sum of its proper divisors (1).

642515110451 is an equidigital number, since it uses as much as digits as its factorization.

642515110451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 35.

Adding to 642515110451 its reverse (154011515246), we get a palindrome (796526625697).

The spelling of 642515110451 in words is "six hundred forty-two billion, five hundred fifteen million, one hundred ten thousand, four hundred fifty-one".