166596451 has 4 divisors (see below), whose sum is σ = 190395952. Its totient is φ = 142796952.

The previous prime is 166596421. The next prime is 166596461. The reversal of 166596451 is 154695661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154695661 = 409 ⋅378229.

It is a cyclic number.

It is not a de Polignac number, because 166596451 - 2⁹ = 166595939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166596398 and 166596407.

It is not an unprimeable number, because it can be changed into a prime (166596421) 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, 11899740 + ... + 11899753.

It is an arithmetic number, because the mean of its divisors is an integer number (47598988).

Almost surely, 2^166596451 is an apocalyptic number.

166596451 is a deficient number, since it is larger than the sum of its proper divisors (23799501).

166596451 is an equidigital number, since it uses as much as digits as its factorization.

166596451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23799500.

The product of its digits is 194400, while the sum is 43.

The square root of 166596451 is about 12907.2247598002. The cubic root of 166596451 is about 550.2439149527.

The spelling of 166596451 in words is "one hundred sixty-six million, five hundred ninety-six thousand, four hundred fifty-one".