166800513623265 has 24 divisors (see below), whose sum is σ = 289122470452608. Its totient is φ = 88959787725600.

The previous prime is 166800513623251. The next prime is 166800513623287. The reversal of 166800513623265 is 562326315008661.

166800513623265 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 0 + 0 + 5 + 1 + 3 + 623 + 2 + 6 + 5 = 666.

166800513623265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166800513623265 - 2⁷ = 166800513623137 is a prime.

It is a super-2 number, since 2×166800513623265² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1727689 + ... + 18346278.

It is an arithmetic number, because the mean of its divisors is an integer number (12046769602192).

Almost surely, 2^{166800513623265} is an apocalyptic number.

166800513623265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166800513623265 is a deficient number, since it is larger than the sum of its proper divisors (122321956829343).

166800513623265 is a wasteful number, since it uses less digits than its factorization.

166800513623265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20258629 (or 20258626 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The spelling of 166800513623265 in words is "one hundred sixty-six trillion, eight hundred billion, five hundred thirteen million, six hundred twenty-three thousand, two hundred sixty-five".