166505975837 has 8 divisors (see below), whose sum is σ = 167104893120. Its totient is φ = 165908057760.

The previous prime is 166505975807. The next prime is 166505975849. The reversal of 166505975837 is 738579505661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166505975837 - 2¹² = 166505971741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166505975837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166505975807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84878 + ... + 583280.

It is an arithmetic number, because the mean of its divisors is an integer number (20888111640).

Almost surely, 2^166505975837 is an apocalyptic number.

It is an amenable number.

166505975837 is a deficient number, since it is larger than the sum of its proper divisors (598917283).

166505975837 is an equidigital number, since it uses as much as digits as its factorization.

166505975837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499603.

The product of its (nonzero) digits is 47628000, while the sum is 62.

The spelling of 166505975837 in words is "one hundred sixty-six billion, five hundred five million, nine hundred seventy-five thousand, eight hundred thirty-seven".