165378872537 has 2 divisors, whose sum is σ = 165378872538. Its totient is φ = 165378872536.

The previous prime is 165378872467. The next prime is 165378872587. The reversal of 165378872537 is 735278873561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150591339721 + 14787532816 = 388061^2 + 121604^2 .

It is a cyclic number.

It is not a de Polignac number, because 165378872537 - 2²⁴ = 165362095321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165378872537.

It is not a weakly prime, because it can be changed into another prime (165378872587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82689436268 + 82689436269.

It is an arithmetic number, because the mean of its divisors is an integer number (82689436269).

Almost surely, 2^165378872537 is an apocalyptic number.

It is an amenable number.

165378872537 is a deficient number, since it is larger than the sum of its proper divisors (1).

165378872537 is an equidigital number, since it uses as much as digits as its factorization.

165378872537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59270400, while the sum is 62.

The spelling of 165378872537 in words is "one hundred sixty-five billion, three hundred seventy-eight million, eight hundred seventy-two thousand, five hundred thirty-seven".