642612061513 has 2 divisors, whose sum is σ = 642612061514. Its totient is φ = 642612061512.

The previous prime is 642612061489. The next prime is 642612061529. The reversal of 642612061513 is 315160216246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 367918672969 + 274693388544 = 606563^2 + 524112^2 .

It is a cyclic number.

It is not a de Polignac number, because 642612061513 - 2⁹ = 642612061001 is a prime.

It is not a weakly prime, because it can be changed into another prime (642612061613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321306030756 + 321306030757.

It is an arithmetic number, because the mean of its divisors is an integer number (321306030757).

Almost surely, 2^642612061513 is an apocalyptic number.

It is an amenable number.

642612061513 is a deficient number, since it is larger than the sum of its proper divisors (1).

642612061513 is an equidigital number, since it uses as much as digits as its factorization.

642612061513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 642612061513 its reverse (315160216246), we get a palindrome (957772277759).

The spelling of 642612061513 in words is "six hundred forty-two billion, six hundred twelve million, sixty-one thousand, five hundred thirteen".