166018327635653 has 8 divisors (see below), whose sum is σ = 166635006987768. Its totient is φ = 165401772997824.

The previous prime is 166018327635647. The next prime is 166018327635697. The reversal of 166018327635653 is 356536723810661.

It can be written as a sum of positive squares in 4 ways, for example, as 25021274524129 + 140997053111524 = 5002127^2 + 11874218^2 .

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 166018327635653 - 2⁴ = 166018327635637 is a prime.

It is a super-2 number, since 2×166018327635653² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166018327635613) 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, 28510826 + ... + 33836427.

It is an arithmetic number, because the mean of its divisors is an integer number (20829375873471).

Almost surely, 2^{166018327635653} is an apocalyptic number.

It is an amenable number.

166018327635653 is a deficient number, since it is larger than the sum of its proper divisors (616679352115).

166018327635653 is an equidigital number, since it uses as much as digits as its factorization.

166018327635653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62357143.

The product of its (nonzero) digits is 97977600, while the sum is 62.

The spelling of 166018327635653 in words is "one hundred sixty-six trillion, eighteen billion, three hundred twenty-seven million, six hundred thirty-five thousand, six hundred fifty-three".