166026506465425 has 6 divisors (see below), whose sum is σ = 205872868017158. Its totient is φ = 132821205172320.

The previous prime is 166026506465359. The next prime is 166026506465437. The reversal of 166026506465425 is 524564605620661.

It can be written as a sum of positive squares in 3 ways, for example, as 17506200721 + 166009000264704 = 132311^2 + 12884448^2 .

It is not a de Polignac number, because 166026506465425 - 2²¹ = 166026504368273 is a prime.

It is a super-2 number, since 2×166026506465425² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166026506465425.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3320530129284 + ... + 3320530129333.

Almost surely, 2^{166026506465425} is an apocalyptic number.

It is an amenable number.

166026506465425 is a deficient number, since it is larger than the sum of its proper divisors (39846361551733).

166026506465425 is an equidigital number, since it uses as much as digits as its factorization.

166026506465425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6641060258627 (or 6641060258622 counting only the distinct ones).

The product of its (nonzero) digits is 62208000, while the sum is 58.

The spelling of 166026506465425 in words is "one hundred sixty-six trillion, twenty-six billion, five hundred six million, four hundred sixty-five thousand, four hundred twenty-five".