78531183068537 has 2 divisors, whose sum is σ = 78531183068538. Its totient is φ = 78531183068536.

The previous prime is 78531183068483. The next prime is 78531183068561. The reversal of 78531183068537 is 73586038113587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44217233356816 + 34313949711721 = 6649604^2 + 5857811^2 .

It is a cyclic number.

It is not a de Polignac number, because 78531183068537 - 2¹⁶ = 78531183003001 is a prime.

It is not a weakly prime, because it can be changed into another prime (78531183068587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39265591534268 + 39265591534269.

It is an arithmetic number, because the mean of its divisors is an integer number (39265591534269).

Almost surely, 2^{78531183068537} is an apocalyptic number.

It is an amenable number.

78531183068537 is a deficient number, since it is larger than the sum of its proper divisors (1).

78531183068537 is an equidigital number, since it uses as much as digits as its factorization.

78531183068537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 101606400, while the sum is 65.

The spelling of 78531183068537 in words is "seventy-eight trillion, five hundred thirty-one billion, one hundred eighty-three million, sixty-eight thousand, five hundred thirty-seven".