166389370001 has 4 divisors (see below), whose sum is σ = 166493300004. Its totient is φ = 166285440000.

The previous prime is 166389369989. The next prime is 166389370009. The reversal of 166389370001 is 100073983661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139689810001 + 26699560000 = 373751^2 + 163400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166389370001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166389370009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51962600 + ... + 51965801.

It is an arithmetic number, because the mean of its divisors is an integer number (41623325001).

Almost surely, 2^166389370001 is an apocalyptic number.

It is an amenable number.

166389370001 is a deficient number, since it is larger than the sum of its proper divisors (103930003).

166389370001 is a wasteful number, since it uses less digits than its factorization.

166389370001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103930002.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 166389370001 in words is "one hundred sixty-six billion, three hundred eighty-nine million, three hundred seventy thousand, one".