68670815537 has 2 divisors, whose sum is σ = 68670815538. Its totient is φ = 68670815536.

The previous prime is 68670815503. The next prime is 68670815567. The reversal of 68670815537 is 73551807686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66480949921 + 2189865616 = 257839^2 + 46796^2 .

It is a cyclic number.

It is not a de Polignac number, because 68670815537 - 2⁸ = 68670815281 is a prime.

It is not a weakly prime, because it can be changed into another prime (68670815567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34335407768 + 34335407769.

It is an arithmetic number, because the mean of its divisors is an integer number (34335407769).

Almost surely, 2^68670815537 is an apocalyptic number.

It is an amenable number.

68670815537 is a deficient number, since it is larger than the sum of its proper divisors (1).

68670815537 is an equidigital number, since it uses as much as digits as its factorization.

68670815537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 68670815537 in words is "sixty-eight billion, six hundred seventy million, eight hundred fifteen thousand, five hundred thirty-seven".