166740401 has 8 divisors (see below), whose sum is σ = 172634880. Its totient is φ = 160855632.

The previous prime is 166740383. The next prime is 166740407. The reversal of 166740401 is 104047661.

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 166740401 - 2²⁶ = 99631537 is a prime.

It is a super-2 number, since 2×166740401² = 55604722651281602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166740407) 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, 60806 + ... + 63488.

It is an arithmetic number, because the mean of its divisors is an integer number (21579360).

Almost surely, 2^166740401 is an apocalyptic number.

It is an amenable number.

166740401 is a deficient number, since it is larger than the sum of its proper divisors (5894479).

166740401 is a wasteful number, since it uses less digits than its factorization.

166740401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4855.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 166740401 is about 12912.7998900316. The cubic root of 166740401 is about 550.4023513190.

The spelling of 166740401 in words is "one hundred sixty-six million, seven hundred forty thousand, four hundred one".