166015561323605 has 128 divisors (see below), whose sum is σ = 252134249472000. Its totient is φ = 102314027971584.

The previous prime is 166015561323589. The next prime is 166015561323653. The reversal of 166015561323605 is 506323165510661.

It is a cyclic number.

It is not a de Polignac number, because 166015561323605 - 2⁴ = 166015561323589 is a prime.

It is a super-2 number, since 2×166015561323605² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1542798734 + ... + 1542906336.

It is an arithmetic number, because the mean of its divisors is an integer number (1969798824000).

Almost surely, 2^{166015561323605} is an apocalyptic number.

It is an amenable number.

166015561323605 is a deficient number, since it is larger than the sum of its proper divisors (86118688148395).

166015561323605 is a wasteful number, since it uses less digits than its factorization.

166015561323605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108483.

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 166015561323605 in words is "one hundred sixty-six trillion, fifteen billion, five hundred sixty-one million, three hundred twenty-three thousand, six hundred five".