166026255501 has 16 divisors (see below), whose sum is σ = 222751300608. Its totient is φ = 109993857600.

The previous prime is 166026255467. The next prime is 166026255503. The reversal of 166026255501 is 105552620661.

It is a happy number.

It is not a de Polignac number, because 166026255501 - 2¹¹ = 166026253453 is a prime.

It is a super-2 number, since 2×166026255501² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166026255501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166026255503) 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 in 15 ways as a sum of consecutive naturals, for example, 425971 + ... + 716591.

It is an arithmetic number, because the mean of its divisors is an integer number (13921956288).

Almost surely, 2^166026255501 is an apocalyptic number.

It is an amenable number.

166026255501 is a deficient number, since it is larger than the sum of its proper divisors (56725045107).

166026255501 is a wasteful number, since it uses less digits than its factorization.

166026255501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291812.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 166026255501 in words is "one hundred sixty-six billion, twenty-six million, two hundred fifty-five thousand, five hundred one".