87320645066537 has 2 divisors, whose sum is σ = 87320645066538. Its totient is φ = 87320645066536.

The previous prime is 87320645066533. The next prime is 87320645066563. The reversal of 87320645066537 is 73566054602378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63755290365481 + 23565354701056 = 7984691^2 + 4854416^2 .

It is a cyclic number.

It is not a de Polignac number, because 87320645066537 - 2² = 87320645066533 is a prime.

It is a super-2 number, since 2×87320645066537² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87320645066537.

It is not a weakly prime, because it can be changed into another prime (87320645066533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43660322533268 + 43660322533269.

It is an arithmetic number, because the mean of its divisors is an integer number (43660322533269).

Almost surely, 2^{87320645066537} is an apocalyptic number.

It is an amenable number.

87320645066537 is a deficient number, since it is larger than the sum of its proper divisors (1).

87320645066537 is an equidigital number, since it uses as much as digits as its factorization.

87320645066537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 152409600, while the sum is 62.

The spelling of 87320645066537 in words is "eighty-seven trillion, three hundred twenty billion, six hundred forty-five million, sixty-six thousand, five hundred thirty-seven".