165625514205551 has 2 divisors, whose sum is σ = 165625514205552. Its totient is φ = 165625514205550.

The previous prime is 165625514205517. The next prime is 165625514205611. The reversal of 165625514205551 is 155502415526561.

165625514205551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165625514205551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165625514205493 and 165625514205502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165625514205751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82812757102775 + 82812757102776.

It is an arithmetic number, because the mean of its divisors is an integer number (82812757102776).

Almost surely, 2^{165625514205551} is an apocalyptic number.

165625514205551 is a deficient number, since it is larger than the sum of its proper divisors (1).

165625514205551 is an equidigital number, since it uses as much as digits as its factorization.

165625514205551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000000, while the sum is 53.

The spelling of 165625514205551 in words is "one hundred sixty-five trillion, six hundred twenty-five billion, five hundred fourteen million, two hundred five thousand, five hundred fifty-one".