165521373527 has 2 divisors, whose sum is σ = 165521373528. Its totient is φ = 165521373526.

The previous prime is 165521373491. The next prime is 165521373571. The reversal of 165521373527 is 725373125561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165521373527 - 2⁶ = 165521373463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165521370527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82760686763 + 82760686764.

It is an arithmetic number, because the mean of its divisors is an integer number (82760686764).

Almost surely, 2^165521373527 is an apocalyptic number.

165521373527 is a deficient number, since it is larger than the sum of its proper divisors (1).

165521373527 is an equidigital number, since it uses as much as digits as its factorization.

165521373527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 47.

The spelling of 165521373527 in words is "one hundred sixty-five billion, five hundred twenty-one million, three hundred seventy-three thousand, five hundred twenty-seven".