165603651251 has 2 divisors, whose sum is σ = 165603651252. Its totient is φ = 165603651250.

The previous prime is 165603651173. The next prime is 165603651271. The reversal of 165603651251 is 152156306561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165603651251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165603651199 and 165603651208.

It is not a weakly prime, because it can be changed into another prime (165603651271) 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, 82801825625 + 82801825626.

It is an arithmetic number, because the mean of its divisors is an integer number (82801825626).

Almost surely, 2^165603651251 is an apocalyptic number.

165603651251 is a deficient number, since it is larger than the sum of its proper divisors (1).

165603651251 is an equidigital number, since it uses as much as digits as its factorization.

165603651251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 165603651251 in words is "one hundred sixty-five billion, six hundred three million, six hundred fifty-one thousand, two hundred fifty-one".