166505497459 has 16 divisors (see below), whose sum is σ = 204788696256. Its totient is φ = 132121728000.

The previous prime is 166505497399. The next prime is 166505497471. The reversal of 166505497459 is 954794505661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166505497459 - 2²⁹ = 165968626547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166505497397 and 166505497406.

It is not an unprimeable number, because it can be changed into a prime (166505597459) 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, 11461642 + ... + 11476159.

It is an arithmetic number, because the mean of its divisors is an integer number (12799293516).

Almost surely, 2^166505497459 is an apocalyptic number.

166505497459 is a deficient number, since it is larger than the sum of its proper divisors (38283198797).

166505497459 is a wasteful number, since it uses less digits than its factorization.

166505497459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22937886.

The product of its (nonzero) digits is 40824000, while the sum is 61.

The spelling of 166505497459 in words is "one hundred sixty-six billion, five hundred five million, four hundred ninety-seven thousand, four hundred fifty-nine".