166731180722 has 6 divisors (see below), whose sum is σ = 250097637279. Its totient is φ = 83365301630.

The previous prime is 166731180713. The next prime is 166731180743. The reversal of 166731180722 is 227081137661.

It can be written as a sum of positive squares in only one way, i.e., 83365590361 + 83365590361 = 288731^2 + 288731^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=288731.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 433097 + ... + 721827.

Almost surely, 2^166731180722 is an apocalyptic number.

166731180722 is a deficient number, since it is larger than the sum of its proper divisors (83366456557).

166731180722 is an frugal number, since it uses more digits than its factorization.

166731180722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577464 (or 288733 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 166731180722 in words is "one hundred sixty-six billion, seven hundred thirty-one million, one hundred eighty thousand, seven hundred twenty-two".