166390134641 has 8 divisors (see below), whose sum is σ = 166495077504. Its totient is φ = 166285229040.

The previous prime is 166390134601. The next prime is 166390134697. The reversal of 166390134641 is 146431093661.

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 166390134641 - 2⁶ = 166390134577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166390134592 and 166390134601.

It is not an unprimeable number, because it can be changed into a prime (166390134601) 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, 18166235 + ... + 18175391.

It is an arithmetic number, because the mean of its divisors is an integer number (20811884688).

Almost surely, 2^166390134641 is an apocalyptic number.

It is an amenable number.

166390134641 is a deficient number, since it is larger than the sum of its proper divisors (104942863).

166390134641 is an equidigital number, since it uses as much as digits as its factorization.

166390134641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18631.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 166390134641 in words is "one hundred sixty-six billion, three hundred ninety million, one hundred thirty-four thousand, six hundred forty-one".