166026255563 has 16 divisors (see below), whose sum is σ = 199747441920. Its totient is φ = 134807102496.

The previous prime is 166026255557. The next prime is 166026255631. The reversal of 166026255563 is 365552620661.

It is a cyclic number.

It is not a de Polignac number, because 166026255563 - 2¹⁶ = 166026190027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166026255503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1801481 + ... + 1891397.

It is an arithmetic number, because the mean of its divisors is an integer number (12484215120).

Almost surely, 2^166026255563 is an apocalyptic number.

166026255563 is a deficient number, since it is larger than the sum of its proper divisors (33721186357).

166026255563 is a wasteful number, since it uses less digits than its factorization.

166026255563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103826.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 166026255563 in words is "one hundred sixty-six billion, twenty-six million, two hundred fifty-five thousand, five hundred sixty-three".