166857901 has 8 divisors (see below), whose sum is σ = 195848960. Its totient is φ = 139155408.

The previous prime is 166857853. The next prime is 166857913. The reversal of 166857901 is 109758661.

It is a happy number.

166857901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166857901 - 2⁹ = 166857389 is a prime.

It is a super-2 number, since 2×166857901² = 55683118252251602, which 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 (166857961) 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, 321861 + ... + 322378.

It is an arithmetic number, because the mean of its divisors is an integer number (24481120).

Almost surely, 2^166857901 is an apocalyptic number.

It is an amenable number.

166857901 is a deficient number, since it is larger than the sum of its proper divisors (28991059).

166857901 is an equidigital number, since it uses as much as digits as its factorization.

166857901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644283.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 166857901 is about 12917.3488379001. The cubic root of 166857901 is about 550.5316083169.

The spelling of 166857901 in words is "one hundred sixty-six million, eight hundred fifty-seven thousand, nine hundred one".